The invention discloses a heat-dissipation LED stress lamp cap with high efficiency and large power, comprising an independent general lamp body consisting of a lamp body shell, an electric apparatus chamber cover, a light transmission shielding plate, an LED light source component, an optical management device, an LED driving control circuit, a lamp body upper cover, a head cover, an installation cover and a sealing ring; the lamp body shell, the lamp body upper cover and the light transmission shielding plate enclose a sealed chamber; the LED light source component is arranged in the chamber and is closely attached to the lower surface of the upper cover of the lamp body; the external side of the upper cover of the lamp body is provided with a plurality of heat dissipation ribs which are used for increasing the whole heat dissipation area of the lamp cap; the optical management device is arranged at the LED light source component; simultaneously, the lamp body shell and the electric apparatus chamber cover plate enclose another sealed chamber; the chamber body is internally provided with the LED driving control circuit. The LED street lamp cap has the advantages of scientific, reasonable and simple structure, easy production and manufacture, low cost, convenient installation and assembly, good heat dissipation effect, high luminescence efficiency and long service life.