The invention relates to an LED lamp radiator. The LED lamp radiator comprises a first radiating part and a second radiating part; the first radiating part is connected to a heat source of an LED lamp, and comprises a plurality of first radiating fins; the second radiating part comprises a plurality of second radiating fins; the multiple second radiating fins and the multiple first radiating fins are alternately arranged in a staggered mode; an air convection gap is formed between the first radiating fins and the second radiating fins; and the radiator is divided into two radiating parts so that heat can be distributed on the two radiating parts in a staggered mode, air convection can be formed by utilizing non-uniform distribution of temperatures between the two radiating parts, and therefore the purpose of effectively improving the radiating efficiency under the same radiator size can be achieved.