The invention discloses an LED ceiling lamp long in service life. The LED ceiling lamp comprises a mounting plate, and a
lamp shell is mounted at the lower end of the mounting plate; an
LED lamp bodyis installed in the
lamp shell;aliquid
storage tank is formed in the side wall of the mounting plate; a sliding plug is connected into the
liquid storage tank in a sealing and sliding manner; and theliquid
storage tank is filled with cooling liquid, a condensation
pipe is embedded in the
lamp shell, the liquid inlet end and the liquid outlet end of the condensation
pipe both communicate with theinterior of the
liquid storage tank, a first one-way valve and a second one-way valve are installed in the liquid inlet end and the liquid outlet end of the condensation
pipe correspondingly, and a driving device for driving the sliding plug to move up and down is installed in the
liquid storage tank. The driving device is arranged,when the temperature in the lamp body is too high, the driving device can operate, the sliding plug can move up and down in the
liquid storage tank, under the flow limiting effect of the two one-way valves, cooling liquid is forced to flow in the condensation pipe in a one-way circulation mode, heat generated in the lamp body can be dissipated, damage to the lamp body by high temperature is avoided, and the service life of the lamp is prolonged.