The utility model provides a plug-type illuminating lamp, which comprises a plug, an LED and a driving circuit, wherein the plug is used for connecting the lamp with an external power source, and the driving circuit drives the LED to emit light. The driving circuit includes a rectification filter circuit, a planar transformer, a constant-current circuit and a pulse width modulation circuit which are sequentially connected between the plug and the LED, wherein the pulse width modulation circuit is used for pulse width modulation for electric signals after rectification filtering, and the planar transformer can be directly plugged onto a socket of a wall to be used. The plug-type illuminating lamp has the advantages of light weight, small volume, low thickness, difficult falling and convenient use.