LED lamp provided with rotary cooling fins

The utility model discloses an LED lamp provided with rotary cooling fins. The LED lamp comprises a lampshade, a light-pervious cover, the multiple cooling fins and an LED chip, wherein the light-pervious cover is fixedly installed on the bottom surface of the lampshade, a closed installation part is formed between the lampshade and the light-pervious cover, the LED chip is installed in the installation part, and the cooling fins are distributed on the lower surface of the lampshade in a spiral mode; the LED chip comprises a first support, a second support, conductive binder, a PN joint, a sapphire and fluorescent powder, the first support and the second support serve as a P-type semiconductor and an N-type semiconductor respectively, the conductive binder is applied to the near end of the first support and the near end of the second support, the two ends of the bottom of the PN joint are connected with the first support and the second support through the conductive binder respectively, the sapphire is instal