The invention discloses a transport vehicle weighing device which comprises a transport vehicle body. The transport vehicle body is fixedly connected with a transport box, the bottom end of the interior of the transport box is fixedly connected with weighing sensors, overload blocks are arranged between the weighing sensors, rubber springs are arranged on two sides of the overload blocks, the topof each rubber spring is fixedly connected with a first connecting plate, the top of each first connecting plate is connected with a plurality of air bags, a storage box is placed at the tops of the weighing sensors, the top of the transport box is connected with a third connecting plate through springs, a rubber plate is fixedly connected to the bottom end of the third connecting plate, a fourthconnecting plate is fixedly connected to one side of the storage box, a fixing plate is connected to one side, close to the fourth connecting plate, of the transport box, a first hydraulic telescopicrod is connected to the fixing plate, and the movable end of the first hydraulic telescopic rod is connected with an ejector block. The transport vehicle weighing device has the beneficial effects that injected materials can be weighed, and the storage box is prevented from being influenced by vehicle bumping.