The invention discloses a method of a zero passage switch of an electromagnetic relay and a circuit, wherein an electromagnetic relay zero passage pull-in method comprises the following steps of: setting an initial value of the pull-in initial lead of the electromagnetic relay; detecting the input alternating voltage; pulling in the electromagnetic relay in advance before the input alternating zero point by the initial value of the pull-in initial lead of the electromagnetic relay according to pull-in control signals and the predicted input alternating zero point; detecting the actual pull-intime point of the electromagnetic relay and the input alternating zero point; if the actual pull-in time point of the electromagnetic relay and the input alternating zero point are identical, ending the detection; if not, modifying the pull-in initial lead of the electromagnetic according to the error between the actual pull-in time point of the electromagnetic relay and the input alternating zeropoint; and then repeatedly executing the steps. The invention solves the problems of striking fire of the electromagnetic relay and EMI by a circuit self-learning way, improves the service life of the relay, and reduces the manufacture cost of circuit design.