The invention relates to the technical field of new energy, and discloses a tidal power generator for new energy. According to the tidal power generator for the new energy, longitudinal displacement can be converted into rotating motion through the gears and the one-way mechanism, the power is directly generated from liquid level contact, therefore, the liquid level difference formed by tides and sea waves can be effectively converted into kinetic energy, then the kinetic energy is converted into electric energy, the effective conversion rate is high, and the power generation efficiency is improved through size limitation among the four gears. The phenomenon that resetting cannot be achieved or resetting is not timely due to insufficient gravity is prevented, a power source formed by tides can act on the generator to the maximum extent through control of the four one-way bearings, potential energy of the entering tides can be utilized to the maximum extent through the guide mechanism, energy conversion is improved, and then the power generation efficiency is improved. Electric energy can be generated when the buoyancy valve moves upwards and can also be generated when the buoyancy valve moves downwards, so that the electric energy is continuously generated, and the electric energy conversion rate is increased.