The invention discloses an LED drive circuit suitable for controlled silicon light adjustment. The circuit comprises an outer controller and an LED driver, and is characterized in that the LED driver comprises a rectifier bridge, a main circuit, a phase angle detection circuit and a current control circuit. The LED drive circuit detects the phase of the trigger angle of a thyristor through the phase angle detection circuit and the current control circuit, and controls the brightness of an LED lamp through phase change; when the trigger angle of the thyristor is minimum, the LED lamp is brightest; when the trigger angle of the thyristor increases, the sawtooth wave peak value of the detection circuit increases and a level signal rises; the current control circuit feeds back the change to the main circuit and the output current of the main circuit decreases to darken the LED lamp, and vice versa. The LED drive circuit has simple structure and extremely low cost, and can obtain ideal light adjustment effect without a complicated modulation-demodulation circuit or a wireless transmission and receiving device; therefore, the circuit is suitable for light adjustment circuits controlled by any controlled silicon.