The heat transfer performance of a tube type water-cooled radiator is numerically simulated, and this experiment is designed to verify it. The model is established from the pipe using the louvered and flat tube fin units to perform a comprehensive performance analysis. The louver angle of the tube-belt louver is analyzed, and the results show that the louver angle of the radiator is between 23°~27°, its heat dissipation effect is the best, and a scheme of fin structure optimization is verified by numerical simulation. Compared with the traditional structure, the heat dissipation effect is considerably improved. The test bench was set up and the orthogonal experiment table was designed to study the degree of influence of different factors on the overall heat dissipation effect of the radiator. The experimental results showed that in the scope of this experimental study, the degree of influence of three factors, namely, inlet water temperature, circulating water flow, and fan speed, on radiator heat dissipation is as follows: inlet water temperature > circulating water flow > fan speed.