Switching valve with private disassembly prevention effect for liquefied gas steel cylinder

The invention relates to a switching valve with a private disassembly prevention effect for a liquefied gas steel cylinder. The switching valve with the private disassembly prevention effect for the liquefied gas steel cylinder comprises a vertically-arranged valve body, wherein the bottom end of the valve body is fixedly connected onto the steel cylinder and communicates with an inner cavity of the steel cylinder; the top end of the valve body is open and communicates with a main flow channel; a rotating rod is arranged outside the valve body, extends into the main flow channel and is fixedly sleeved with a threaded block; the circumferential outer side wall of the threaded block is in threaded connection with the side wall of the main flow channel; the rotating rod located on the side, facing the bottom end of the valve body, of the threaded block is rotationally sleeved with a plugging sleeve; the plugging sleeve is tightly attached to the side wall of the main flow channel; a sliding groove is formed in t