A circumcision apparatus includes a fixed support; a first through hole and a second through hole are machined on the fixed support along a same axial line; a knife rack shaft is penetrated through the first through hole; the first end of the knife rack shaft is connected with a locking mechanism to lock and position the knife rack shaft on the fixed support, the second end of the knife rack shaft is connected with a protective cover; the protective cover is extended to the exterior of the fixed support via the second through hole; the protective cover and the knife rack shaft are coaxial in detachable connection; a positioning sleeve in clearance fit with the protective cover is arranged at the second through hole; the positioning sleeve and the fixed support are in the detachable connection; and a space between the positioning sleeve and the protective cover is adaptive.