The invention provides an LED circuit based on a field effect transistor. The LED circuit includes a stabilized current circuit, a voltage stabilizing circuit and a field effect circuit that are successively connected, one end of the stabilized current circuit is connected with a rectification circuit, and one end of the voltage stabilizing circuit is grounded. The power supply output to the two ends of an LED lamp is controlled by the field effect transistor, and the output voltage and the output current can be controlled. The circuit is simple to implement and stable in performance, reduces the production cost, and can drive the LED lamp to further promote the popularization and application of the LED lamp.