LED lamp power supply control circuit

An LED lamp power supply control circuit comprises a leading edge phase cutting switch module working under an AC voltage, a trigger module used for controlling the on-off of the leading edge phase cutting switch module, an RC time delay module used for controlling the trigger time of the trigger module, and a voltage stabilization module enabling the RC time delay module to work under a fixed voltage value. When an input voltage is not stable, the voltage stabilization module enables the RC time delay module to work under a set stable voltage value, thereby enabling a trigger cycle set by the RC time delay module not to change. When the trigger cycle of the RC time delay module is stable, the on-off time of the leading edge phase cutting switch module is also stable. Therefore, a phase cutting angle of the input AC voltage keeps stable, a subsequent circuit is protected, the accessed loads can work stably, and a phenomenon which changes suddenly, even flashes, and makes the eyes not comfortable does not occur.