The invention discloses a belt conveyor head guide device applied to the material conveying field. The belt conveyor head guide device structurally comprises a driving air cylinder, a connecting shaftand a discharging baffle. The driving air cylinder achieves rotary driving of the shaft through a connecting plate, one end of the discharging baffle is fixedly connected to the connecting shaft, theother end of the discharging baffle is a moving end capable of being connected to a conveying belt or belt conveyor shell, when the moving end is connected with the conveying belt, a first discharging channel communicating with a first discharging opening is defined by the discharging baffle and the belt conveyor shell, and when the moving end is connected with the belt conveyor shell, a second discharging channel communicating with a second discharging opening is formed between the discharging baffle and the conveying belt. The guide device and the head of a belt conveyor are fused into a whole, the guide device does not need to be additionally customized, cost is reduced, the structure is integrated, the need of the device for the application space is reduced, due to the simple structure, achieving of the subsequent maintaining operating can be obtained, meanwhile, operation is convenient and controllable, the application effect is improved, and practicability of the device is ensured.