Constant-temperature pre-heating and instant-heating double-cavity-container electric water heater

The utility model provides a constant-temperature pre-instant heating double-cavity-container electric water heater. A water storage inner container of the constant-temperature pre-instant heating double-cavity-container electric water heater is provided with two communicated water storage cavities. The bottom end of the water storage inner container is provided with two inner container installation openings corresponding to the two water storage cavities, and a preheating integrated assembly and an instant heating integrated assembly are installed at the bottom end of the water storage inner container. The preheating integrated assembly comprises a water inlet three-way pipe, a preheating mounting plate, a preheating electric heating pipe and a water inlet pipe, the preheating electric heating pipe and the water inlet pipe are fixed to the preheating mounting plate, the preheating mounting plate is mounted on the inner container mounting opening of one water storage cavity, the preheating electric heating pi