A circumcision anastomat comprises an upper anastomat, a lower anastomat and a fastening adjusting component which are connected with one another by connecting devices. An outer knife, an inner knife, a prepuce cutting buffer groove, the corresponding connecting device and a prepuce cutting adjusting device are arranged on the upper anastomat, prepuce cutting grooves are arranged on the inner knife, frenulum protecting portions are arranged on both the outer knife and the inner knife, and cutting surfaces with the frenulum protecting portions and a cutting surface of a main body are not positioned on the same horizontal plane and form a triangular arc-shaped structure. The circumcision anastomat is simple in structure, low in cost and convenient to use, purposes of accurate operation location, short operative time and post-operation healing time and capabilities of preventing edema and infection and reducing suffering of patients can be truly achieved, and merits of the disposal circumcision anastomat as compared with traditional operation can be truly reflected. Besides, recent and long-term post-operation effects are obviously superior to those of a currently used like device, and the circumcision anastomat is suitable for circumcision in various hospitals.