The invention relates to a hoisting device, in particular to a telescopic hoisting device for a container. The telescopic hoisting device for the container is mounted in the container and can hoist large-scale equipment into and out of the container. The telescopic hoisting device comprises a fixed beam, a movable arm, an oil cylinder and an oil cylinder power system, wherein the fixed beam is mounted on a ceiling inside the container; the movable arm, the oil cylinder and the oil cylinder power system are all mounted on the fixed beam; the movable arm is driven to move by the oil cylinder; a piston rod of the oil cylinder is controlled to be telescopic through the oil cylinder power system; and the movable arm is provided with a hoisting equipment hanging opening connected with externally-hung hoisting equipment. The telescopic hoisting device for the container can hoist the large-scale equipment into and out of the container, thereby lowering the operation dangerousness while saving labor.