The invention discloses a cascade main wheel shaft seat of an escalator. The cascade main wheel axle seat comprises a seat body, a shaft sleeve and a locking part. An insertion part is arranged on theouter wall of the shaft sleeve; a shaft sleeve mounting hole is formed in the seat body corresponding to the shaft sleeve; the shaft sleeve mounting hole penetrates the seat body axially; a slot is formed in the inner wall of the shaft sleeve mounting hole corresponding to the insertion part; the shaft sleeve is inserted into the shaft sleeve mounting hole axially and is in clearance fit connection to the shaft sleeve mounting hole, and the insertion part is inserted into the slot and is locked in the slot through the locking part. After the shaft sleeve and the seat body are assembled, rotation and axial movement of the shaft sleeve can be limited, so that the stability of the shaft sleeve in a follow-up welding process is improved effectively.