The utility model relates to a guide wall of a storage tank, and can effectively solve the problems that the traditional guide wall has a large size, difficulty in construction, high cost and poor efficiency. The technical scheme implemented to solve the problems is as follows: the guide wall of the storage tank comprises L-shaped reinforced concrete prefabricated panels and rockfill, wherein the L-shaped reinforced concrete prefabricated panels are connected to form a guide wall body of the storage tank, and rockfill is arranged at the two sides of the wall body; the short side of each L-shaped reinforced concrete prefabricated panel is placed on the bottom surface of the storage tank, and the long side of each L-shaped reinforced concrete prefabricated panel is erected and is 0.5m higher than the highest design water level of the storage tank; and a spongy cushion is arranged at a lap joint between the adjacent L-shaped reinforced concrete prefabricated panels. The guide wall of the storage tank has the advantages that the structure is simple, a lot of investment is saved, the construction is facilitated, the construction period is shortened, the size of a diversion dike is reduced, the efficacy of the storage tank is increased, and the safe operation and the routine maintenance are favorable.