An external electrical-control lamp with improved structure includes a light-emitting diode lamp (1), an external power box (2), and a dimmer (4). The light-emitting diode lamp (1) has a circuit board (11), at least one light-emitting diode (12), a thermal module (13), and a rectifying circuit (14). The light-emitting diode (12) is installed on the circuit board (11), the thermal module (13) provides a heat-dissipating function to the light-emitting diode (12), and the rectifying circuit (14) provides a rectified power to the light-emitting diode (12). When a utility power (3) is supplied to the dimmer (4) and the external power box (2), a variable resistor of the dimmer (4) is adjusted and the utility power (3) is controlled by the external power box (2), thus adjusting the brightness of the light-emitting diode (12).