Power supply control circuit of LED lamp

The invention relates to a power supply control circuit of an LED lamp, which comprises an AC/DC constant current power supply and an LED lamp load. The power supply control circuit of the LED lamp further comprises a control module. The control module comprises a control signal generation unit, a load feedback unit, a comparison unit and a shunting unit, wherein the control signal generation unit is used for providing control signals and providing a reference value for the comparison unit; the load feedback unit is used for providing load signals for the comparison unit; the comparison unit compares the load signals and the reference value and outputs the control signals; and the shunting unit is switched on or off according to the control signals so as to control the current loaded at the shunting unit. The power supply control circuit of the LED lamp controls the shunting unit to shunt direct current provided by the AC/DC constant power supply, so that a purpose of changing the current loaded at the LED lamp is achieved, and thus a purpose of changing brightness variations of the LED lamp load is achieved.