A dual-phase relay comprises two contact opening and closing systems controlling respective circuits to be disconnected and connected, a magnetic driving device providing driving force and push-pull rods transmitting the driving force provided by the magnetic driving device simultaneously to act on the two contact opening and closing systems. The magnetic driving device drives a plunger to carry out straight line reciprocating action by using an electromagnetic coil with alterable polarities, the plunger is connected to one end of a transmission piece and drives the transmission piece to rotate around the own rotating axis, and the push-pull rods are driven to carry out straight line reciprocating action through the other end of the transmission piece. According to the dual-phase relay, the magnetic driving device drives the plunger to carry out the straight line reciprocating action by using the electromagnetic coil, and then drives the push-pull rods to act through rotation of the transmission piece, and therefore the contact states of the two contact opening and closing systems are changed simultaneously. Compared with the patented technology with the document number of EP2009665B1, the dual-phase relay is different in technical conception, same effects can be achieved, and the dual-phase relay has better anti-vibration performance.