The invention discloses a factory workshop exterior wall advertising projection device. The factory workshop exterior wall advertising projection device comprises a shell and guide rails, wherein the guide rails are vertically fixed at the top of a workshop exterior wall from top to bottom and sucked on the front face of the workshop exterior wall through N vacuum suckers. A trolley is arranged on the guide rails, a projector is fixed at the top of the trolley, a fastening structure is arranged on the side face of the trolley, a rubber air bag is arranged on the outer surface of each of wheels, a sealing pad is arranged at the edge of every vacuum sucker and provided with an air leakage preventing structure, a pulley, a first switch, a storage battery, an air pump and a fixed plate are fixed in the shell, the pulley is connected with one end of a traction rope, and the top of the trolley is connected with the other end of the traction rope. The factory workshop exterior wall advertising projection device is high in safety and reasonable in design by utilizing the workshop exterior wall area space reasonably.