Protective device of shearing machine

The utility model discloses a shearing machine protection device which comprises a baffle, a light generator and a light receiver. The baffle is arranged above a workbench on the shearing machine, and a channel is formed between the lower side of the baffle and the upper surface of the workbench; the light generator and the light receiver are both arranged on the upper surface of the workbench, the light generator and the light receiver are oppositely arranged on the two sides of the channel, and the light generator and the light receiver are arranged on the workbench. The channel is suitable for a plate to pass through, and when fingers of an operator reach the position of the channel, the fingers are used for shielding light signals between the light generator and the light receiver, so that the shearing machine stops working; or the channel is suitable for the plate and the fingers to pass through, so that when the hand back part of the operator reaches the channel position, the hand back part is used for