High-safety redundant heat dissipation system and heat dissipation method for air-cooling and water-cooling two-stage heat exchange under water cut-off working condition

The invention discloses a high-safety redundant heat dissipation system and heat dissipation method for air-cooling and water-cooling two-stage heat exchange under a water-break working condition, and the system comprises a water-cooling heat dissipation assembly which comprises at least two water-cooling radiators which are arranged in parallel, and one end of the water-cooling heat dissipation assembly is provided with an external circulation water outlet; the fan coil assembly is arranged at the other end of the water-cooling heat dissipation assembly, and an outer circulation water inlet is formed in one end of the fan coil assembly. The inner circulation assembly comprises a power mechanism, one end of the power mechanism is connected to a pipeline between the outer circulation water inlet and the fan coil assembly, the other end of the power mechanism is connected to a pipeline of a water outlet of the water cooling radiator, and a liquid inner circulation bypass is formed through the inner circulation