Reliable sealing purging joint

The utility model discloses a reliable sealing purging joint, which comprises a locking nut, a connecting body, a scavenging pipe and a purging connecting pipe, wherein the purging connecting pipe is fixedly pressed on the connecting body through the locking nut, and is communicated with the scavenging pipe; annular grooves are formed in the end face, by which the purging connecting pipe is pressed, of the locking nut and the end face, by which the purging connecting pipe is pressed, of the connecting body; and the pressed part of the purging connecting pipe is deformed and embedded into the annular grooves. The pressed part of the purging connecting pipe is embedded into the annular grooves, so that the leakage of gas is prevented, and the sealing reliability is ensured.