The invention relates to the technical field of waste collection mechanisms, and particularly relates to a waste pushing device. The waste pushing device comprises a waste collection platform, a lifting plate, a lifting cylinder in drive connection with the lifting plate, and a pushing mechanism connected with the waste collection platform, wherein the pushing mechanism comprises a pushing plate connected with the waste collection platform, a synchronous belt connected with the pushing plate, and a motor in drive connection with the synchronous belt; and the lifting plate is arranged below the waste collection platform and bulges out of the waste collection platform. During a production process, wastes are stacked on the waste collection platform by a punching machine manipulator, and fall onto the lifting plate from the waste collection platform, the lifting plate is lifted by the lifting cylinder, the upper surface of the lifting plate contacts with the lower surface of the waste collection platform, the motor drives the synchronous belt, the synchronous belt drives the pushing plate, the pushing plate drives the waste collection platform to move to push towards the wastes on the lifting plate and then push the wastes out of the lifting plate, and the wastes fall into a waste collection frame. The waste pushing device has the advantages of being simple in structure and low in production cost.