Pipeline joint locking device

The invention relates to the field of aero-engine component test part pipeline structure design, in particular to a pipeline joint locking device to at least solve the problem of an existing locking device that a pipeline joint is hard to mount and dismount. The pipeline joint comprises a gland nut and a hexagonal conical port. The pipeline joint locking device comprises a first stop ring and a second stop ring which are arranged in a horizontally symmetrical mode and detachably connected, a first damping gasket and a second damping gasket which are arranged in a horizontally symmetrical mode, and stop fins, wherein the gland nut is fastened by the stop rings through the damping gaskets, and the stop fins are used for fixing the relative positions of the first stop ring, the second stop ring and the conical port. According to the locking device, the connected gland nut and hexagonal conical port are tightly pressed by means of the stop rings and the damping gaskets matched with the stop rings, so that sealing and fixing effects are better; the first stop ring and the second stop ring are detachably connected to facilitate assembly and disassembly and can be repeatedly used.