The utility model discloses a compound pipe of fire - retardant insulation relates to compound pipe field, and it includes that rubber inlayer, phenolic foam layer and rubber are outer, and on phenolic foam located on the layer outer surface of rubber inlayer, the rubber skin was located on the outer surface on phenolic foam layer. The utility model provides a compound pipe of fire - retardant insulation, it is drawn shock resistance stronger, and can work under the alkali environment.