Arresting, lifting, storage and supplement four-in-one rainwater collection and supplementary irrigation system for dry farmland

The invention discloses a blocking, lifting, storing and supplementing four-in-one rainwater collecting and supplementing system for a dry farmland, which relates to the field of irrigation and comprises a water blocking unit, a photovoltaic power generation water lifting unit, a high-level water storage unit and an irrigation and water supplementing unit, the water retaining unit comprises a dam arranged in a ditch and is used for intercepting and storing constant water flow or seasonal water flow of a river channel and supplying water to the irrigation water supplementing unit for irrigation; the photovoltaic power generation water lifting unit comprises a photovoltaic power generation assembly and a water pump water lifting assembly, the photovoltaic power generation assembly is used for converting solar energy into electric energy, and the water pump water lifting assembly is used for transferring water stored in the water blocking unit to the high-position water storage unit through a water pump and a water pipe which communicate with each other; the high-position water storage unit comprises a water storage container located at the high position and is used for water supply of the irrigation water supplementing unit for irrigation. The water retaining unit, the photovoltaic power generation water lifting unit, the high-position water storage unit and the irrigation water supplementing unit are combined with one another, water retaining, water lifting, water storage and irrigation are integrated, and the utilization rate of rainwater resources can be remarkably increased.