The present invention discloses a waterproof stage light with efficient heat dissipation comprising a light source component, a heat dissipating system and a waterproof main housing, wherein an opening is arranged at the rear end of the main housing, the heat dissipating system is in seal connection with the opening; one end of the heat dissipating system is positioned inside the main housing and the other end is positioned outside the main housing; and the light source component is arranged on the end of the heat dissipating system that is positioned inside the main housing. The stage light according to the present invention, which is simple in structure and convenient in use, improves the operation effect, normal service life, and reliability and stability of the stage light, and has a waterproof function, the stage light thus can be normally used outdoors with expanding application.