The invention discloses an LED automobile lamp. The LED automobile lamp comprises a lamp holder, a lamp source and a lampshade. The lamp source and the lampshade are fixedly connected to the lamp holder, and cooling fins are connected with the lower portion of the lamp holder; a protruding edge which extends outwards is arranged at the upper end of the lamp holder, and a protrusion is arranged on the protruding edge; a containing groove is formed in the bottom of the lampshade, and a sealing ring is fixedly arranged in the containing groove; the protrusion is located in the sealing ring; and internal heat can be emitted out through the cooling fins, and the service life of the automobile lamp is prolonged. Meanwhile, through the sealing ring, sealing performance between the lamp holder and the lampshade is effectively ensured, and therefore the phenomena of water leakage and gas leakage are effectively avoided.