Lift car of construction hoist with extension ladder

The lift car comprises a lift car main body, the extension ladder and a suspension device, the extension ladder is installed on the lift car main body, the extension ladder comprises a fixed joint, a first extension joint and a second extension joint, the fixed joint is installed on the lift car main body, the first extension joint is inserted in the fixed joint in a sliding mode, and the second extension joint is inserted in the second extension joint in a sliding mode. The second telescopic joint is inserted into the first telescopic joint in a sliding manner, and the extension length of the extension ladder can be changed through the extension of the first telescopic joint and the second telescopic joint; the suspension device acts on the end, away from the fixed joint, of the second telescopic joint so as to stabilize the extension ladder in the stretching-out state. The pedestrian path from the car main body to the building is built, and the length of the extension ladder is adjustable, so that when the