The invention relates to a multiway valve tail connector, a multiway valve and a hydraulic system. The multiway valve tail connector comprises an oil return port, a working oil way oil return port, and an oil return way for communicating the oil return port with the working oil way oil return port. The multiway valve tail connector further comprises an inner load feedback oil port for obtaining load feedback information, and/or a pilot oil return inlet for discharging pilot returned oil, and/or an inner oil inlet for communicating with pressure oil of a reversing connector of the multiway valve. The multiway valve tail connector can be used more sufficiently and reasonably, and is not only used as a terminal block of the multiway valve.