Telescopic aluminum box sleeve

The telescopic aluminum box sleeve comprises a first telescopic cylinder, a second telescopic cylinder, a third telescopic cylinder and a fourth telescopic cylinder which are hollow and provided with openings in the side faces, the first telescopic cylinder and the third telescopic cylinder are detachably connected, sliding grooves are formed in the inner walls of the first telescopic cylinder and the third telescopic cylinder, and sliding strips are arranged on the outer walls of the second telescopic cylinder and the fourth telescopic cylinder. The sliding strips correspond to the sliding grooves in position, clamping grooves are formed in the inner walls of the sliding grooves, spring buckles are arranged on the outer walls of the sliding strips, and the spring buckles can be clamped into the clamping grooves to achieve positioning. The second telescopic cylinder and the fourth telescopic cylinder can slide along the first telescopic cylinder and the third telescopic cylinder respectively through cooperati