The invention relates to the technical field of light source heat dissipation, in particular to an air cooling LED light source device. The air cooling LED light source device comprises a mounting frame for supporting an optical lens module and a PCB in sequence from top to bottom; an LED element for emitting light is borne on the PCB; the mounting frame is provided with an air cooling heat dissipating device for locking the PCB and achieving a heat conducting effect; multiple heat dissipating fins for transferring and dissipating heat are mounted in a cavity; and gaps are formed between two adjacent heat dissipating fins for circulating air. The air cooling LED light source device achieves a heat dissipating effect of an LED light source through an air cooling mode; and through the cooling mode, the stable light effect outputting of the LED light source is guaranteed, the heat dissipating space needed by products can be reduced, and the mechanism mounting space is saved.