An improved heat-dissipation structure for a matrix LED lamp is disclosed. The heat-dissipation structure is a plate-shaped metal hood configured to hold an LED matrix module for heat dissipation so as to maintain the entire matrix LED lamp cool. The heat-dissipation structure is a plate-shaped metal shell having a plurality of threaded holes allowing the LED matrix module to be fixed thereto. In virtue of the tight contact between the bottom of the LED matrix module and the plate-shaped metal hood, heat generated by the LED matrix module can be quickly absorbed and dissipated by the plate-shaped metal hood, so as to prevent the LED matrix module from premature aging, thereby enlightening the service life of the LED matrix module.