The invention provides an energy-saving and environment-friendly fish breeding system. The system comprises a feeding pipe, an oxygen supply branch pipe, a suspension rope, a feeding screen device, an oxygen supply main pipe, a photovoltaic panel supporting device, a horizontal feeding device, a control device, a vertical material conveying device, a left side supporting column, an oxygen supply pipe clamp, a right side supporting column, an air detector, a cross beam, a photovoltaic panel, an oxygen supply machine, a roof, a photovoltaic charger, a rainy day monitor, a storage battery and a storage room. The cross beam is arranged at the upper middle portions of the left and right supporting columns; the horizontal feeding device is installed on the upper left portion of the cross beam through bolts. An upper screen and a lower screen are arranged, so that fish feed is easily blocked above the screens, when fishes touch the lower screen, the lower screen moves upwards along a guide rail through a fastening pin, then meshes of the upper screen are aligned to meshes of the lower screen, and the fish feed falls off; waste of the fish feed is avoided, and the system is more convenient to use and convenient to popularize.