The invention discloses a stratified water inlet control method for a heat storage water tank of a solar water heating system. An effect of improving a temperature stratifying effect of the heat storage water tank is achieved by automatically controlling a stratifying position of outlet water of a heat connector entering the heat storage water tank according to the temperature difference between the outlet water of the heat collector and a stratified water body of the heat storage water tank. According to the stratified water inlet control method for the heat storage water tank of the solar water heating system, the stable stratifying effect of the heat storage water tank can be effectively improved, the supply quality and reliability of domestic hot water are improved, the energy utilization efficiency of the system is improved, and the stratified water inlet control method is suitable for large and medium-sized solar water heating systems.