The invention relates to a high-reliability offshore wind power generation facility with a heat dissipation function. The high-reliability offshore wind power generation facility with the heat dissipation function comprises an installation base, a power generation box, a generator, a power generation shaft and multiple fan blades, and further comprises an adjusting mechanism and a heat dissipationmechanism. The adjusting mechanism comprises a lifting plate, a lifting rod, two limiting assemblies, two moving assemblies and two adjusting assemblies. Each moving assembly comprises an air cylinder, a piston, a moving rod, a moving plate, a hinge joint rod and a first spring. The heat dissipation mechanism comprises a support, two transmission assemblies and two heat dissipation assemblies. Each heat dissipation assembly comprises a filtering screen, a rotating shaft, two first bearings and multiple blades. According to the high-reliability offshore wind power generation facility with theheat dissipation function, the function that the height of the power generation box is adjusted is fulfilled by the adjusting mechanism, the probability of the phenomenon that the fan blades are corroded and damaged is reduced, and therefore the reliability and the safety of the offshore wind power generation facility are improved. The function of heat dissipation of the interior of the power generation box is fulfilled by the heat dissipation mechanism, and the phenomenon that due to the fact that the interior of the power generation box is excessively hot, the normal operation of the generator is affected is avoided.