The invention relates to a high-efficiency photovoltaic power generation device with automatic maintenance function, comprises a base, a brace, a solar panel and a maintenance device. The maintenancedevice comprises a cleaning mechanism, a moving plate, a sweeping mechanism and two moving mechanisms, the cleaning mechanism comprises a water tank, a water pump, a water pipe, a spray nozzle, a translation assembly, a liquid injection pipe and a seal cover, the translation assembly comprises a slider, a connecting rod, a first motor and two rollers, the sweeping mechanism comprises a scraper, acoil, a magnet, two orientation units and a plurality of springs. According to the high-efficiency photovoltaic power generation device with automatic maintenance function, the nozzle above the solarpanel is moved by the cleaning mechanism, clean water is supplied to the nozzle by the water pump for cleaning, dust is removed, cleanliness is restored, the power generation efficiency is improved, and sunlight can be received normally by the solar panel for power generation through cleaning snow and other obstacles on surface of the solar panel, normal operation of the equipment is ensured, thereby improving practicality of the equipment.