The invention discloses a parallel switch controlled LED circuit board, and relates to the technical field of a printed circuit board. The circuit board comprises a circuit board body, wherein the circuit board body comprises a metal bottom plate, an AlN ceramic heat conduction layer and a conductive layer, an LED1 until an LEDn are sequentially connected in series, a positive electrode of the LED1 is connected with a positive electrode of an output end of a rectification bridge IC1, a first path of a negative electrode of the LEDn is connected with one end of each of high-voltage switch devices S1 until S in a parallel switch control module C, a second path of the negative electrode of the LEDn is connected with an input end of a feedback module FB, a third path of the negative electrode of the LEDn is connected with a negative electrode of an output end of the rectification bridge IC1, and an output end of the feedback module FB is connected with control ends of the high-voltageswitch devices S1 until S. The circuit board has the characteristics of good cooling effect, high power factor, low cost and small size.