The invention discloses a photovoltaic power generation-based self-circulating plant culture device. The photovoltaic power generation-based self-circulating plant culture device comprises a base, wherein a fertilizer tank is arranged on the right upper end of the base; a water tank is arranged on the left upper end of the base; a water pump 1 is arranged inside the fertilizer tank; a water pump 2is arranged inside water tank; a supporting column is arranged at the upper ends of the fertilizer tank and the water tank; a lifting pipe is arranged inside the supporting column; a right soft pipeconnects the lifting pipe and the water pump 1; a left soft pipe connects the lifting pipe and the water pump 2; spray pipes are arranged on the supporting column; the spray pipes are connected with the lifting pipe; a top frame is arranged at the upper end of the supporting column; lighting lamps are arranged at the lower end of the top frame; a bracket and a storage battery are arranged at the upper end of the top frame. The photovoltaic power generation-based self-circulating plant culture device has an intelligent power generating function, and can provide night lighting, automatic watering and automatic fertilizing functions; the photovoltaic power generation-based self-circulating plant culture device achieves automatic management of watering and fertilizing, without mutual interference; the photovoltaic power generation-based self-circulating plant culture device automatically recycles excess water and excess fertilizer, so that secondary utilization can be achieved and waste isavoided; the spray pipes are arranged into rotatable structures, so that spraying is more thorough.