A replacement structure of a
ratchet wrench comprises a
wrench rod, wherein at least one of the two ends of the
wrench rod is provided with a head part; the head part is provided with a hollow
pulley groove the bottom edge of which is provided with a butting edge; the head part is provided with a fork groove at the periphery of the
pulley groove adjacent to the wrench rod; the head part is provided with a containing groove at the inner wall surface of the fork groove and the top surface of the head part is locked with a cover plate; a registration wheel is arranged on the butting edge of the
pulley groove of the head part, the outer edge of the registration wheel is provided with a plurality of ratchets, and a position adjacent to the top edge, on the outer edge of the registration wheel is provided with a spacing ring groove; a
brake pad is arranged in the fork groove of the head part and is provided with the plurality of the ratchets for braking the registration wheel in an engaged mode; the middle section adjacent to the top edge, of the
brake pad is provided with a limit bump corresponding to the spacing ring groove; the top surface of the
brake pad utilizes a connecting rod to fix zipper pulls which are attached to and abutted against the top surface of the cover plate to move; and the
brake pad is provided with a fixed seat in the containing groove of the head part. The structure in the invention can enhance labor-saving performance and stationarity of the movement of the
brake pad, enables the replacement of the registration wheel to be more smooth and convenient, enhances the structure strength, prolongs the service life and prevents component loss.