The utility model discloses a steel-plastic composite pipe with a lining coated outside, and belongs to the field of pipeline machining. The steel-plastic composite pipe with the lining coated outsidecomprises a lining plastic pipe, a steel pipe and an outer coating, wherein the lining plastic pipe is connected with the steel pipe through an adhesive, the outer coating is sprayed on the surface of the steel pipe, the adhesive at least comprises a first thickness area and a second thickness area which are adjacently arranged, and the approximate thickness value of the first thickness area is different from the approximate thickness value of the second thickness area. The adhesive is respectively in close contact with the plastic pipe and the metal pipe, so that the situations that the metal pipe and the plastic pipe are cracked due to lack of the adhesive and the connection between the plastic pipe and the metal pipe is not tight due to the fact that the tolerance range of the inner diameter of the metal pipe is large are avoided.