Quick positioning device for support

The invention provides a quick support positioning device which comprises a cushion block, a lifting mechanism and a translation mechanism, the lifting mechanism is arranged above the cushion block, the translation mechanism is arranged above the lifting mechanism, a support is placed on the translation mechanism, the lifting mechanism adopts a hydraulic lifting device, the vertical elevation of the translation mechanism above is adjusted through the hydraulic lifting device, and the translation mechanism is arranged above the cushion block. The translation mechanism is mounted above the hydraulic lifting device and comprises a walking track, a truck and an adjusting rod, the adjusting rod comprises a threaded rod and a threaded sleeve, the threaded sleeve is symmetrically fixed to the two ends of the walking track, the threaded rod is sleeved with the threaded sleeve, a handle is arranged at the outer end of the threaded rod, and the threaded rod is rotated through the handle; and the inner end of the thread