Construction elevator protection device

A construction elevator protection device comprises a lift car with a door, a telescopic plate is arranged below a lift car bottom plate, telescopic guardrails are arranged on the two side walls of the lift car respectively, the telescopic plate is driven by a first linear driving mechanism fixedly arranged on the lift car bottom plate to achieve telescopic movement towards one side of the lift car door, and a supporting rod is arranged on the side edge, close to the bottom of the lift car door, of the lift car bottom plate. Rails are arranged on the two side edges of the upper portion of the lift car bottom plate, the bottom of the telescopic guardrail is located in the rails, the telescopic guardrail is driven by a second linear driving mechanism to stretch out and draw back, the second linear driving mechanism is fixed to the side wall of the lift car, a control panel is arranged in the lift car and connected with the controller, and the first linear driving mechanism and the second linear driving mechanis