The invention discloses an auxiliary fixing device for surgical operation. The device includes a fixing bed, a fixing mattress is arranged on the fixing bed, arm blocking cushions, fixing belts, a left leg fixing belt and a right leg fixing belt are arranged on the fixing mattress, protection layers are arranged on the arm blocking cushions, the blocking cushions are connected to the fixing mattress through fixing layers, one ends of the fixing belts are connected to the fixing mattress through left fixing belt buckles, the other ends of the fixing belts are connected to the fixing mattress through right fixing belt buckles, a left connection fixing groove is formed in the bottom of the left leg fixing belt, a fixing connection piece is arranged in the left connection fixing groove, the left leg fixing belt is connected to the fixing mattress through the fixing connection piece, a right connection fixing groove is formed in the bottom of the right leg fixing belt, a fixing connection piece is arranged in the right connection fixing groove, and the right leg fixing belt is connected to the fixing mattress through the fixing connection piece. The auxiliary fixing device for surgicaloperationhas the advantages of being novel in design, safe, reliable, convenient to move, and capable of fixing the head of a patient through a silica gel suction cup and a head holding disc, and thusan ideal operation effect is achieved.