The invention discloses a stainless steel composite corrosion-resistant ribbed bar and a manufacturing method thereof. The stainless steel composite corrosion-resistant ribbed bar is composed of a core part, a middle alloy layer and a stainless steel surface layer. The material of the core part is low alloy steel, the material of the middle alloy layer is a nickel base alloy or a copper base alloy, and the material of the stainless steel surface layer is stainless steel. The stainless steel composite corrosion-resistant ribbed bar has corrosion-resistant performance of a stainless steel bar and can also reach or exceed the intensity of an ordinary hot rolled ribbed bar, and a segment is cut out at any position and can be directly connected through a threaded sleeve; and in the oceaneering and other corrosive environments, the corrosion-resistant service life of the ribbed bar can be guaranteed, the construction efficiency can be improved, and the engineering cost can be reduced. in the method, stainless steel box iron can be produced in an intensification manner, it is not required to additionally arrange a cold roll forming unit in front of an existing bar steel rolling production line, and the equipment investment is low; and wrapping of the middle alloy layer of a billet adopts a manner that two pieces of box iron are combined in a left-right symmetrical manner, and compared with a twining wrapping manner, imbedded of the middle alloy layer is easier and more convenient.