The invention relates to the technical field of gardens, in particular to a rainwater collection and
irrigation device and method used for a garden. The rainwater collection and
irrigation device comprises a
water storage tower and a flow-diversion well, wherein the upper portion of the flow-diversion well can be communicated with an underground rainwater pipeline. The bottom on the side face of the flow-diversion well is communicated with the top of the
water storage tower through a first
water collection pipe, a funneled rainwater collector is arranged on the side face of the
water storage tower, the bottom of the funneled rainwater collector is communicated with the side face of the water storage tower through a second
water collection pipe, a valve is arranged at the position where the bottom of the funneled rainwater collector is connected with the second
water collection pipe, and a plurality of spraying pipes are arranged below the funneled rainwater collector. A
sprayer is arranged at one end of each spraying pipe, the other end of each spraying pipe is communicated with the second water collection pipe, and a second water pump is arranged at the position, between the water storage tower and the spraying pipes, on the second water collection pipe. According to the rainwater collection and
irrigation device and method used for the garden, rainwater is directly collected, the rainwater in the underground rainwater pipeline is collected and filtered, and accordingly, the rainwater
utilization rate is higher due to diversified collections; meanwhile, a rainwater irrigation device is arranged, so that the rainwater collection and irrigation device is multifunctional.