The invention relates to a facility for rainwater collection regulation and control, fertilization and irrigation for greenhouse cultivation, which comprises a reservoir, a fertilization pool and a water collection well. One side of the reservoir is connected with the fertilization pool, and the fertilization pool is communicated with the water collection well through a water distribution pipe; an upper part of the outside of the fertilization pool connected with the reservoir is provided with the water collection well parallel to the end face of the fertilization pool; the side walls of the water collection well are provided with a shed surface rainwater collection guide pipe, a pavement rainwater collection guide pipe and a tap water pipe which are communicated with the fertilization pool respectively; and a dirt blocking net is arranged in the water collection well, and a tap water control valve which is opened as required is arranged on the tap water pipe connected into the water collection well. The other side in the reservoir is provided with a sand suction pipe and a drop irrigation main pipe respectively; the end face of the reservoir is provided with a precast cover plate in parallel; the reservoir is communicated with the fertilization pool through a water guide pipe; and a fertilizer feeding port is arranged above the corresponding fertilization pool. The facility can relieve limited water resources for sunlight greenhouses, effectively collect rainwater, optimize the water source, improve the night soil coupling and utilizing efficiency, and improve the ecological environment.