Insulation pipe easy to splice

The utility model relates to the field of thermal insulation pipes, in particular to a thermal insulation pipe easy to splice, and aims to solve the technical problem that rotation is very difficult when long and heavy thermal insulation pipes are in threaded connection. An annular groove is formed in one end of a first outer pipe, an annular sliding block is arranged in the annular groove in a sliding mode and connected to a sleeve, and the sleeve is connected to the outer portion of a second outer pipe in a sleeved mode. The inner wall of the sleeve is connected with a threaded sleeve, end-to-end threads are arranged at the contact ends of the first inner pipe and the second inner pipe, the internal threads of the threaded sleeve can be connected with the threads of the first inner pipe and the second inner pipe at the same time, after the two outer pipes are in butt joint through the sleeve, the threads of the two inner pipes are connected end to end, and the threaded sleeve is in threaded connection with