The utility model discloses a spine fixing and operation auxiliary supporting device which is composed of two bed side support rods, a support rod locking mechanism and an adjusting sliding table mechanism. The two bed side support rods are connected with an operation bed, the adjusting sliding table mechanism and the two bed side support rods are transversely connected through a transverse beam and locked and fixed through an upper locking handle and a lower locking handle. A longitudinal beam and the transverse beam penetrate through a sliding adjusting block in a crosswise mode, the side face of the longitudinal beam is provided with a plurality of positioning holes, the longitudinal beam and the adjusting block are longitudinally locked through the longitudinal locking handle, the upper face of the longitudinal beam is provided with a plurality of counter bores and observing holes, and spinous process pincers are inserted into the counter bores in the longitudinal beam through spinous process pincers connecting parts. A support cover is arranged at one end of the longitudinal beam and is longitudinally positioned through a fine-adjusting positioning and locking screw, and a cross-shaped target spot is fixedly installed at the top end of the longitudinal beam. By means of the spine fixing and operation auxiliary supporting device, the persistence precision of the operation can be guaranteed, the bad influence caused by a long-time operation is reduced, the spine fixing and operation auxiliary supporting device provides auxiliary supporting and positioning for suitable operation auxiliary instruments, and scanning of medical images and computer information registering are facilitated. The spine fixing and operation auxiliary supporting device is flexible in operation and convenient to use.