The invention discloses a special measuring method for an inclined prism, and belongs to the technical field of surveying and mapping. The prism is obliquely placed; the coordinates of the prism in different inclined positions are measured; an equation set between the coordinates of the prism and the coordinates of a to-be-measured point is established; and the equation set is solved to obtain thecoordinates of the to-be-measured point, thereby solving the point location measurement precision problem that prism leveling cannot be performed due to field condition limitation. According to the method, computer calculation is realized through programming; written measurement software is installed in a total station or a mobile terminal; the coordinates of the to-be-measured point can be obtained by inputting the coordinates of the prism in the different inclined positions to the measurement software for calculation; real-time calculation of the coordinates of the to-be-measured point, andreal-time data display are realized; the calculation speed is high; and the precision is reliable. In the measuring process, the pole bottom of the prism only needs to be placed on the to-be-measuredpoint and the prism does not need to be leveled, so that the operation can be carried out by non-professionals, the investment of measuring professionals is reduced, the working efficiency is improved, and the investment cost is reduced.