The invention relates to a laser composite repair method for surface corrosion of an inner hole of a shell. The laser composite repair method comprises the following steps of disassembling and cleaning the surface of an inner hole of a powder push rod shell, and measuring the dimensions; determining the local corrosion part and corrosion amount of the inner hole; analyzing the powder push rod shell and evaluating the life of the powder push rod shell according to the detection results, and removing the corrosion layer of the inner hole of the shell; and adopting magnetic particle testing, andensuring that no crack defects occur after removal of the corrosion layer. By adopting preset additive materials of microarc deposition GH4169 corrosion resistant metal bars, the trouble that powder is hard to reach the repair part of the inner hole in a laser cladding feeding mode is overcome; by adopting a microarc deposition and laser scanning composite processing mod, a specific method for corrosion repair of the inner hole is formed; beneficial reference is provided for damage repair of the inner hole, and the repair method has the advantages of low heat input amount and thermal deformation amount, and less heat effect on and heat damage to metal base; and the repair quality of the inner hole of the shell can be improved obviously.