As wind power technology continues to advance, wind power generators are increasingly moving towards offshore installations and larger capacities. This evolution demands enhanced heat dissipation capabilities from generators. Evaporative cooling systems, characterized by their robust heat dissipation capacity, high reliability, and ease of maintenance, offer significant advantages for large offshore wind power generators over traditional cooling methods. This study presents a detailed analysis of a four-channel parallel self-circulating evaporative cooling system, designed with a slight inclination. Utilizing a homogeneous model, this paper derives the dynamic resistance balance equation of the system. By applying an iterative method in MATLAB, this paper generates static bifurcation diagrams depicting variations in system flow rate in response to changes in thermal load. Furthermore, a scaled 1:1 experimental platform was constructed to emulate real operational conditions of a wind generator. Measurements of the flow rate across each channel under varying thermal loads were conducted, and the empirical data closely aligns with our theoretical predictions, thereby validating our model. These findings offer valuable insights for the design of self-circulating evaporative cooling systems in large-scale offshore wind power generators.