The utility model relates to an electric heating tube service life testing device, in particular for 3000 h life test tubular electric heating element, which belongs to the technical field of electric heating tube. It comprises a water tank and a control box, water inlet pipe is provided with the unidirectional electromagnetic valve, water tank is provided with a water level sensor. The sink is arranged at intervals of a fixture, each clamp is fixed with a electric heating tube. The control box and the water level sensor, a one-way electromagnetic valve and the electric heating tube is electrically connected, the control box comprises a PLC programmable controller, the control box according to the water level sensor to detect the height of water level, and according to the opening and closing of the water inlet pipe height control one-way solenoid valve level, at the same time control of electric heating tube. The utility model has the advantages of simple structure, compact, reasonable, the test device of automatic timing, automatic timing, high degree of automation; with water protection, over temperature protection and overcurrent protection and many other protection function; and has the advantages of water saving, saving space etc..