Hydraulic lifting device

The invention provides a hydraulic lifting device. The problems that special vehicle accessories are heavy, and no tool is suitable for assembling operation and maintaining operation of space-restricted accessories are solved. The hydraulic lifting device comprises an upper bracket, a lower bracket, connection rod assemblies and an oil cylinder; the two sets of connection rod assemblies are arranged between the upper bracket and the lower bracket; each set of connection rod assembly comprises a first connection rod and a second connection rod which form a scissors-like structure through a middle pin shaft in a hinged mode; the upper bracket and the lower bracket are each provided with two guide beams with guide grooves; guide shafts are arranged at the upper ends of the first connection rods and the upper ends of the second connection rods, are matched with the guide grooves correspondingly and can slide in the guide grooves; the upper ends of the first connection rods and the lower ends of the second connect