Production method of composite-material water tank

The invention discloses a production method of a composite-material water tank, and aims at providing the production method of the composite-material water tank which is high in product surface hardness, good in glossiness and good in weather fastness. The production method is characterized by comprising the following steps of I, preparing a surface pretreatment material, which is prepared from the following materials in parts by weight: 240 parts of m-phenyl neopentyl glycol, 400 parts of aluminum hydroxide, 40 parts of pigment paste, 5 parts of an accelerant and 5 parts of a curing agent; II, adding m-phenyl neopentyl glycol and the accelerant into an agitator in sequence to carry out agitation, then adding aluminum hydroxide to carry out the agitation, meanwhile, clearly cleaning the surface of a mold, coating a mold release agent, and adding the curing agent into the well agitated materials to continuously agitate to form the surface pretreatment material; III, first material scraping: pouring the surface