Heat dissipation with high heat flux has always attracted much attention. In this paper, a heat dissipation scheme of liquid metal jet impinging cooling is proposed in order to achieve efficient heat dissipation on the surface with high heat flux density. Using Ga₆₈ln₂₀Sn₁₂ and Na₂₂K₇₈ as working fluids, the numerical simulation of impinging heat transfer of liquid metal jet was carried out, and compared with water jet. In addition, the firing distance and inlet velocity were changed to explore their effects on the heat transfer performance of liquid metal jet. The results show that under the same working conditions, the average heat transfer coefficient of Na₂₂K₇₈ jet and Ga₆₈ln₂₀Sn₁₂ jet is 3.7 and 6 times higher than that of water jet, respectively. And the heat transfer performance is the best when the firing distance is less than 2 times the jet aperture. Changing the firing distance in the jet core area has little effect on the heat transfer performance. While continuously increasing the firing distance beyond the core area will not be conducive to heat transfer. The inlet flow rate has a significant effect on the heat transfer performance. So increasing the flow rate can enhance the heat transfer, but the enhancement effect will gradually weaken. The research results of this paper are of reference value for the study of heat dissipation with high heat flux.