The invention provides a corrosion-resistant composite bimetal longitudinal submerged-arc welded steel pipe and a method for manufacturing the same. The method includes steps of (1), manufacturing bimetal composite steel plates by a hot rolling process; (2), carrying out edge milling, pre-bending, JCO forming and pre-welding on the bimetal composite steel plates manufactured in the step (1); (3), welding weld joints of a steel pipe by a submerged-arc welding process, particularly, welding a carbon steel layer of a base layer at first when the weld joints are welded, and then welding metal of a clad layer of a corrosion-resistant layer. The steel pipe is obtained after JCO forming and pre-welding are carried out on the bimetal composite steel plates. The corrosion-resistant composite bimetal longitudinal submerged-arc welded steel pipe and the method have the advantages that the corrosion-resistant metallurgical composite bimetal longitudinal submerged-arc welded steel pipe is manufactured by a hot rolling metallurgical composite bimetal steel plate and JCOE pipe manufacturing process and the efficient automatic submerged-arc welding process, double layers of metal of the steel pipe can be metallurgically combined with each other, and accordingly the steel pipe is high in strength, integrity and corrosion resistance; the JCOE pipe manufacturing process is adopted, so that the steel pipe is high in mechanical degree, production efficiency and overall dimensional accuracy, and steel pipes with the lengths of 12 meters can be produced by the method.