Carrier

The utility model discloses a carrier comprising a bottom plate, a bracket and an outer plate. The bottom plate is vertically and fixedly connected with the outer plate; a universal wheel is mounted at the lower end of the outer plate; the bracket is provided with a driving wheel; and a thrust bearing for steering the driving wheel is arranged between the bracket and the bottom plate. The carrier is characterized in that the bottom plate is fixedly provided with a vertically arranged hydraulic cylinder which is in seal connection with a piston rod internally; the end part of the piston rod passes through the thrust bearing and is rotatably supported on the bracket; and the hydraulic cylinder is provided with a piston rod driving device. The carrier has the advantage that the piston rod driving device drives the piston rod to move downward without changing the self weight and carrying capacity of the carrier, the hydraulic cylinder moves upward and drives the universal wheel to lift upward through the bottom p