The invention discloses a rainwater collecting and recycling system for a slope road with a ditch in a southwest hilly area. A rainwater collecting and recycling device is arranged between the slope road and a drainage ditch in the southwest hilly area, the rainwater collecting and recycling device is composed of a water collecting tank, a filtering layer, a gravel layer, a hedgerow and a water pumping device, the water collecting tank is of a closed cavity body structure, the top of the water collecting tank is sequentially provided with the filtering layer, the gravel layer and the hedgerow upwards, the water collecting tank and the drainage ditch are arranged in parallel, the upper part of the water collecting tank is provided with an overflow hole which communicates with the drainage ditch, the bottom position of the water collecting tank is lower than the bottom position of the drainage ditch, the water pumping device comprises a water suction pump, a water pumping pipe and a water outlet pipe, the water suction pump is arranged on one side of the hedgerow, the water pumping pipe is connected with a water inlet of the water suction pump, and a water outlet pipe is connected with a water outlet of the water suction pump. According to the rainwater collecting and recycling system, rainwater resources can be balanced, recycling of rainwater is realized, and loss of water, soil and nutrients in southwest hilly area is reduced.