Metal lining multi-layer composite pipe and manufacturing method thereof

The invention discloses a metal lining multi-layer composite pipe and a manufacturing method thereof, the composite pipe comprises an inner pipe, a middle layer and an outer pipe which are sequentially sleeved from inside to outside, the outer pipe comprises a socket part, a straight pipe part and a spigot part made of a corrosion-resistant metal material which are sequentially connected, and the inner pipe covers the inner wall and the end face of the outer pipe. The manufacturing method comprises the following steps that S1, the inner walls and the outer walls of the bellmouth part and the straight pipe part are treated, and the inner pipe and the spigot part are manufactured; s2, the inserting opening part and the straight pipe part are fixedly connected; s3, the inner pipe, the middle layer and the outer pipe are sequentially arranged from inside to outside; s4, the inner pipe and the middle layer are pressed on the outer pipe; s5, compounding; and S6, flanging and sealing one end of the inserting opening