The invention discloses an improved LED down lamp. The improved LED down lamp comprises a mounting plate, a lamp body and a radiator; the mounting plate is sleeved at one end of the lamp body; the other end of the lamp body is connected with the radiator; the radiator includes a heat dissipating body; the heat dissipating body is felloe-shaped; multiple heat dissipating pieces are arranged at the outer periphery of the heat dissipating body; the multiple heat dissipating pieces are uniformly distributed at the outer periphery of the heat dissipating body; and the heat dissipating pieces are wedged. The improved LED down lamp is simple in structure; and through skillful design of the radiator, the LED down lamp is liable to dissipate heat and fast in heat dissipating speed, and further improves the use safety.