Floor type constant-temperature electric water heater with waste heat recovery function

A floor type constant-temperature electric water heater with a waste heat recovery function comprises a shell, an inner container, an electric heating body, a cold water inlet pipe, a hot water outletpipe and an electric constant-temperature valve. The waste hot water waste heat recovery device comprises a waste hot water inlet connector, a waste water drainage connector, a tap water inlet connector and a preheated water outlet connector; the electric thermostatic valve and the waste hot water waste heat recovery device are arranged in the shell; the waste hot water waste heat recovery deviceis arranged at the upper part or the lower part of the liner; the water inlet end of the water inlet pipe fitting is communicated with the preheated water outlet connector, the water outlet end of the water inlet pipe fitting is communicated with the water inlet end of the cold water inlet pipe, and the water outlet end of the cold water inlet pipe faces the bottom of the liner; the water outletend of the hot water outlet