The utility model provides an old bridge demolition lifting device, and belongs to the technical field of old bridge demolition lifting. The old bridge dismantling and lifting device comprises a vehicle body, mounting columns are arranged at the four corners of the top of the vehicle body, hydraulic rods are arranged at the tops of the four sets of mounting columns, second hydraulic cylinders are arranged at one ends of the hydraulic rods, and supporting legs are arranged at the bottoms of the second hydraulic cylinders; through mutual cooperation of the vehicle body, the hydraulic rods, the supporting rods, the second hydraulic cylinders, the linear drivers and the mounting disc, the multiple sets of hydraulic rods on the top of the vehicle body are controlled to extend, the second hydraulic cylinders are started to drive the supporting legs to move to the ground, when the supporting legs make full contact with the ground, the four corners of the vehicle body can be limited, and the linear drivers below the vehicle body can be controlled; the linear driver can drive the installation disc to move towards the ground, when the installation disc is adjusted to make contact with the ground, the lower portion of the cab can be supported, the stability of the cab is improved, and follow-up dismantling and hoisting of an old bridge are facilitated.