Vehicle-mounted hoisting device

A vehicle-mounted hoisting device comprises two track beams which are symmetrically installed on the top of a carriage in the longitudinal direction of a vehicle body, a movable cantilever beam is arranged between the two track beams, walking motors and driving wheel sets are arranged on the left side and the right side of the middle of the movable cantilever beam, and each walking motor is meshed with the corresponding driving wheel set through a driving gear fixed to a motor shaft. Driven wheel sets are arranged on the left side and the right side of the tail end of the movable cantilever beam and matched with the track beam in a rolling mode, an installation base is arranged on the movable cantilever beam, a supporting shaft is arranged on the installation base, the driving wheel sets and the driven wheel sets are supported on the supporting shaft through bearings, and a winding motor is installed at the lower end of the movable cantilever beam through a connecting plate. The movable cantilever beam is pro