The invention provides a prefabricated steel structural superposed 
shear wall and a construction method thereof. According to a prefabricated steel structural superposed 
shear wall plate, each 
shear wall comprises two double-faced heat preservation light wall plates; a deep longitudinal groove and a plurality of rows of transverse holes penetrating through the groove are formed in each 
wall plate;and self-locking components formed by 
welding a plurality of 
steel plates are arranged on the left and the right of a wall body, and the wall body can select different chaining lock catches and tailend lock catches according to different joints. The upper, lower, left and right portions of the wall body are all of symmetrical structures, a plurality of rows of transverse penetrating reinforcingsteel bars are arranged in the wall body, longitudinal reinforcing steel bars are connected with the transverse reinforcing steel bars in a 
lap joint or welded mode, and short bars are welded to the joint points of the transverse reinforcing steel bars and the longitudinal reinforcing steel bars. The construction method of the prefabricated steel structural superposed shear wall comprises the following steps that in-situ wire paying off is conducted, and temporary fixing frames are mounted; the shear wall is assembled and spliced in place, and connected and fixed to the temporary fixing frames; a prefabricated upper layer 
floor slab is placed in place; hidden beam 
steel plates and various additional reinforcing steel bars are arranged, and pipelines are arranged; high-fluidity free of vibration concrete is poured; and mounting construction of a next layer is entered in.