Semi-automatic safety protection layer door

The invention belongs to the technical field of safety protection on the construction site and particularly relates to a semi-automatic safety protection layer door for a construction lifter. The semi-automatic safety protection layer door comprises two C-shaped steel guiderails, a lifting motor, a rolling wheel and needle bearing, a mesh protection door, a relay, a wireless receiving module, an uplink stroke switch, a downlink stroke switch, a wireless transmitting module, a magnetic induction sensor and a controller; the slot openings of the two C-shaped steel guiderails are formed on scaffolds on two sides in parallel relatively; the lifting motor is fixed on an upper beam of the C-shaped steel guiderails; the rolling wheel and needle bearing is fixed on two sides of the frame of the mesh protection door and inserted into the C-shaped steel guiderails; the relay, the wireless receiving module, the uplink stroke switch and the downlink stroke switch are all electrically connected with the lifting motor; the wireless transmitting module, the magnetic induction sensor and the controller are arranged on the compartment of the construction lifter and electrically connected with one another; and the magnetic induction sensor is used for controlling the opening and closing of the door of the compartment of the construction lifter. Due to the adoption of the technical scheme, the semi-automatic safety protection layer door is safe to use and can be locked automatically.