Abstract: A simulation study of the fluid heat transfer performance in a self-excited oscillating jet micro-channel radiator is carried out. The results show that under different inlet mass flow rates (1.0~6.0 g/s), the movement of the high-pressure region in the self-excited oscillator causes the deflection of the jet in the micro-channel radiator, which creates the periodic cyclic oscillations of the jet and strengthens the perturbations in the fluid region at the same time. In addition, after comparative analysis, it is found that the impact range of the fluid region in the micro-channel is wider than that in the jet micro-channel, so its temperature uniformity performance is also better than that in the jet micro-channel. At the same time, the paper uses the thermodynamic principle to analyze and evaluate the effect of self-excited oscillation technology on the heat transfer performance of the fluid flow in the jet micro-channel. It is found that the oscillating jets produced by the self-excited oscillator can reduce the irreversible loss in the process of convective heat transfer of the fluid in the jet micro-channel, resulting in a remarkable thermal energy transfer efficiency of up to 98.48%.