The present invention is made in the, more particularly, the method for forming plastic bricks, anthracite coal ash consisting of anthracite coal ash 50 ~ 90wt%, kaolin 10 ~ 40wt%, feldspar 0 ~ 10wt% baehapto relates to a method of manufacturing a plastic brick one, and by the addition of organic and inorganic plasticizer for the hard coal fly ash baehapto vacuum forming after extrusion, to a method of manufacturing baked brick, it characterized in that the plastic forming the brick in a firing furnace. The main raw material of plastic building bricks are used in natural resource endowments in the country to jeokjeomto and kaolin. Recently, however, because of global environmental conservation and situation in Korea in the development of natural resources and endowments in the country to strengthen the environmental policy of land preservation is suppressed, there is an increasingly difficult to secure raw materials for baking bricks, to replace those resources this is the urgent development of a material. There substitutes as industrial wastes such as fly ash, pyeseokgo, dust, Waste Foundry Sand are being reviewed, in a dual Ash has got a similar nature and composition of the kaolin it is suitable as a raw material for plastic bricks. However, in the prior art is unable to the addition amount of the fly ash exceeds 50wt% of the fired brick. This is because the vacuum can not be extruded in the forming process by the addition amount of the fly ash when the fly ash baehapto more than 50wt% to the plasticity of the fly ash baehapto rapidly decreased. Further, even by the press forming of the fly ash Alpenblick amount greater than 50wt%, the cracking in the sintering process to a problem that the compressive strength of the fired Alpenblick degradation occurs. Therefore, the present invention as well as to replace the 50 ~ 90wt% of a natural raw material used in the production of baked brick to the fly ash, improved manufacturing cost reduction and strength of the fired bricks in order to improve the problems of conventional techniques as described above, will to achieve a natural environment due to the reduced amount of the recycling and natural resources of coal ash, fire resistance by using a high coal ash as raw materials for the added amount of coal ash is fly ash baehapto 50 ~ 90wt% to this, and the mixture there was added to the organic and inorganic plasticizer to provide a vacuum extrusion molding and then, the compressive strength for sintering the molded bricks in the tunnel baking furnace 500kgf / ㎠ than anthracite coal ash and the manufacturing method of the content of high-strength plastic brick in order to improve the plasticity degradation.