Control circuit for LED light therapeutic instrument

The control circuit comprises a power supply and an MCU circuit, the power supply is respectively connected with a first constant current circuit, a second constant current circuit, a third constant current circuit and a fourth constant current circuit, the first constant current circuit is connected with the second constant current circuit, and the third constant current circuit is connected with the fourth constant current circuit; the MCU circuit is connected between the first constant current circuit and the second constant current circuit and between the third constant current circuit and the fourth constant current circuit. The MCU circuit is further connected with a first switching circuit, a second switching circuit, a third switching circuit and a fourth switching circuit, the first switching circuit and the second switching circuit are connected to a red light lamp set and a blue light lamp set respectively, and the third switching circuit and the fourth switching circuit are connected to a yellow l