Rainwater garden capable of serving as landscaping water source

The rainwater garden capable of serving as the landscaping water source comprises a device body, the device body comprises a soil layer, a plurality of planting plates are arranged on the upper side of the soil layer, planting holes are formed in the planting plates, a plurality of water flowing holes are formed in the side edges of the planting holes, the water flowing holes are formed in the planting plates, and the water flowing holes are communicated with the planting plates. A permeable layer is arranged on the lower side of the soil layer, and a water seepage pipe is arranged in the permeable layer; the water seepage pipe is arranged, the water seepage pipe is fixedly connected with the water drainage pipe in a penetrating mode, the water drainage pump is arranged, and the water drainage pump is fixedly connected with the water drainage pipe in a penetrating mode through the conveying pipe, so that water in the water storage pond can be drained, and green plants cannot be submerged by the water in the w