The invention belongs to the technical field of medical instruments and particularly relates to a training device for simulating a medical thoracoscopy surgery. The training device comprises a base and a worktable connected to the upper end of the base through bolts, wherein a display screen is placed at one end of the surface of the worktable, dust-covering assemblies are clamped to the surfacesof four sides of the display screen and comprise connecting blocks, dust-covering cloth, rotating shaft rods, magnets, cleaning blocks and clamping blocks, the rotating shaft rods are connected to oneends of the connecting blocks, and the dust-covering cloth is adhered to the surfaces of the rotating shaft rods. By pulling the magnets by a worker, the rotating shaft rods are rotated, the dust-covering cloth on the surfaces of the rotating shaft rods stretch out, second springs are stressed to shrink, sliding blocks slide in sliding chutes, cleaning cotton at the bottom ends of the cleaning blocks tightly cling to the surface of the display screen, and the display screen can be wiped through the movement of the cleaning cotton, so that dust on the surface of the display screen can be conveniently cleaned through the cleaning cotton.