Liftable operating platform used for foundation construction of long and narrow working surface of deep foundation pit

The invention discloses a liftable operating platform used for foundation construction of a long and narrow working surface of a deep foundation pit. The liftable operating platform comprises a supporting frame, a transmission device, lattice components and a truck, wherein a pair of lattice components is fixed at the end parts of the supporting frame in parallel, and the transmission device is arranged at the top of the lattice components; a winch is arranged inside the transmission device, a pulley component is arranged at the lower part of the transmission device, and a steel wire rope on the winch passes through the pulley component to be connected with a load-bearing vehicle; the load-bearing vehicle comprises a base plate, a frame body and a baffle, wherein the frame body is arrangedat the upper part of the load-bearing vehicle, and the baffle is arranged at the periphery of the base plate; and the load-bearing vehicle also comprises a sliding plate, the sliding plate is arranged on the side surface of