The invention discloses an unloading trolley which comprises a connecting cylinder assembly; a discharge port is formed in the lower end of the connecting cylinder assembly through a discharge plate;the connecting cylinder assembly is supported by a hanging bracket; the hanging bracket is arranged on a guide mechanism and moves along with the guide mechanism; the guide mechanism is located at themiddle part of a bracket assembly; a guardrail mounting assembly is arranged at one end of the bracket assembly; a discharge end assembly is arranged at the other end of the bracket assembly; a transmission belt is arranged at the part, located at bottom of the connecting cylinder assembly, of the bracket assembly; a rotating wheel I and a rotating wheel II are arranged at the discharge end assembly and the guardrail mounting assembly correspondingly; the transmission belt are driven to rotate by the rotating wheel I and the rotating wheel II; and when the external part of the unloading trolley pours a building material into the connecting cylinder assembly, the connecting cylinder assembly conveys the building material onto the conveying belt of the bracket assembly through a discharge hopper, and then the conveying belt runs and conveys the building material to the required position. Thus, the conveying efficiency is improved.