Subway channel excavation protection device

The utility model belongs to the technical field of metro contact channel construction, and particularly relates to a metro channel excavation protection device which comprises a tunnel wall, a fixing frame fixedly connected to the interior of the tunnel wall, a baffle fixedly connected to the interior of the fixing frame, a through opening formed in one side of the front face of the baffle, and a protection plate arranged on the front face of the baffle. The front face of the protection plate is rotationally connected with a cover plate, a plurality of reinforcing ribs are jointly and fixedly connected among the top side of the protection plate, the surface of the fixing frame and the tunnel wall, a moving mechanism is arranged on the top side of the interior of the fixing frame, and the moving mechanism comprises a sliding rail; the protection plate can be conveniently moved through the moving mechanism to shield the through opening, the situation that manual closing cannot be achieved due to too large pres