The invention provides a waste resin sampling device. An upper frame is fixed on the ground, and a waste resin injection pipe is mounted in the upper frame in a suspended manner; a lower frame is fixed on a hydraulic trolley, a shielding container is fixed on the lower frame, the hydraulic trolley is arranged in the upper frame through a mounting rail, a barrier plate is arranged at the tail end of the rail, and when the hydraulic trolley is in contact with the barrier plate, the waste resin injection pipe is exactly positioned above the shielding container; the shielding container is hollow, an opening is formed in the top of the shielding container, a sampling container is arranged in the shielding container, a flange-shaped baffle is arranged on the top edge of the sampling container, and when the sampling container is arranged in the shielding container, the bottom surface of the baffle is higher than the top end face of the sampling container; a hydraulic telescopic rod is arranged on the upper frame; a lifting plate in the horizontal direction is mounted at the tail end of the hydraulic telescopic rod; a groove meshed with the appearance of the outer wall of the sampling container is formed in the edge of the lifting plate; and after the groove sleeves with the sampling container, the lifting plate is blocked by the baffle. According to the waste resin sampling device disclosed by the invention, waste resins can be remotely and automatically sampled, and the dangers during manual operations are avoided.