Socket and spigot type different-material multi-layer composite pipe and manufacturing method thereof

The invention discloses a socket and spigot type different-material multilayer composite pipe and a manufacturing method thereof.The composite pipe comprises an inner pipe, a middle layer and an outer pipe which are sequentially connected from inside to outside in a sleeved mode, the inner pipe and the outer pipe are bonded through the middle layer, the outer pipe comprises a socket part, a straight pipe part and a spigot part which are sequentially connected, and a socket bushing ring is arranged at the end, close to the socket part, of the composite pipe; a spigot bushing ring is arranged at the end, close to the spigot part, of the composite pipe. The manufacturing method comprises the steps that S1, the outer pipe is treated, the inner pipe and the middle layer are manufactured, and the bell mouth bushing ring and the spigot bushing ring are manufactured; s2, the middle layer and the inner pipe integrally penetrate into the outer pipe and are compounded through heating; and S3, a spigot bushing ring and a