Abstract: To address weak performance of the disconnectable coupling in the support system of the foundation pit, a threaded sleeve disconnectable coupling was developed in the paper. To study the bearing performance of the threaded sleeve disconnectable coupling, laboratory prototype tests were conducted. The yield load, initial compression stiffness, load displacement curve, stress distribution, and failure mode of the threaded sleeve disconnectable coupling were obtained through the bearing performance test. Meanwhile, the load-bearing performance was compared with traditional single box and double box type disconnectable coupling. The results show that the yield load of the threaded sleeve disconnectable coupling is 10 509.96 kN, and the initial compressive stiffness is 4 215.17 kN·mm^-1. The failure mode of the threaded sleeve disconnectable coupling is that the nut part protrudes outward and the thread is sheared and damaged, with the top five rings most severely damaged. The load-bearing performance of the threaded sleeve disconnectable coupling is better than that of the traditional disconnectable coupling, with a yield load of 2.5 times that of the single box disconnectable coupling and 2.2 times that of the double box disconnectable coupling. The ultimate load is 2.2 times of the single-van type active end and 2.3 times of the double-van type active end. The initial compression stiffness is 4.3 times that of the single box disconnectable coupling and 11.8 times that of the double box disconnectable coupling.