The utility model provides a letter sorting system based on same power, including two conveying unit, clutching mechanism, transmission shaft, driving motor and infrared detectors, two conveying unit install pushing equipment for setting up side by side between two conveying unit, pushing equipment for in pairs, the reverse setting, clutching mechanism's input shaft and output shaft articulate respectively on conveying unit, install driven gear on the input shaft, the transmission shaft passes every conveying unit in proper order, and the driving gear is installed respectively to the position that corresponds driven gear on the transmission shaft, driving motor drive transmission shaft rotates, the infrared detector is installed on every conveying unit, and the infrared detector is connected with clutching mechanism, the pushing equipment who installs in pairs between two conveying unit that set up side by side, backward sets up can move by arbitrary pushing equipment, realizes the one -way letter sorting of goods, can move simultaneously by two pushing equipment again, realizes the two -way letter sorting of goods, and the goods sorts efficiency and improves by a wide margin.