The invention discloses a special auxiliary fixing device for a medical surgery. The device comprises a fixed bed body, the fixed bed body is provided with a fixed mattress, the fixed mattress is provided with a baffle pad, a fixing band, a left leg fixing band and a right leg fixing band, a protective layer is arranged on the baffle pad, the baffle pad is connected to the fixed mattress through afixing layer, one end of the fixing band is connected with the fixed mattress through a left fixing band buckle, the other end of the fixing band is connected with the fixed mattress through a rightfixing band buckle, a left connecting fixing groove is formed in the bottom of the left leg fixing band, the left connecting fixing groove is provided with a fixing connecting piece, the left leg fixing band is connected with the fixed mattress through the fixing connecting piece, a right connecting fixing groove is formed in the bottom of the right leg fixing band, a fixing connecting piece is arranged in the right connecting fixing groove, and the right leg fixing band is connected with the fixed mattress through the fixing connecting piece; the device has a novel design, is safe and reliable, is convenient to move, and can fix the head of the patient through a silicone suction cup and a head tray, thereby achieving optimal surgical results.