GRP/FRP panel sectional molded water storage tank is widely used in daily life and fire fighting water of ordinary residential buildings, commercial and residential buildings, office buildings, residential quarters, government offices, hotels, schools, etc. Production and domestic water of industrial and mining enterprises, water for various types of circulating water, cooling water and hot water supply systems, FRP stainless steel water tank has no leakage, no deformation, etc. The utility model has the advantages of pollution-free, long service life, easy assembly and beautiful appearance, and can be assembled into water tanks of different tonnages according to user's needs.