The invention discloses a non-contact precise-phase control circuit closing device. The device comprises a transformer T1, a comparator U1A, a single-chip microcomputer U2, a wire driver U3A, an optical coupler isolator U4A and a bidirectional thyristor D1, wherein one end of the transformer T1 is connected with the 220V AC, an upper side of the other end of the transformer T1 is connected with one end of a resistor R1, and a lower side of the other end of the transformer T1 is connected with a resistor R2 and a pin 2 of the comparator U1A. The bidirectional thyristor is utilized as a switching device, there is no mechanical contact component in the switching process, the transient overvoltage caused by the mechanical contact switch is suppressed, the conduction speed of the bidirectionalthyristor is fast, the phase delay is within the error range, and accurate phase control is facilitated. The device is advantaged in that the voltage phase during conduction of the thyristor is controlled by the single-chip microcomputer, so phase selection and control are made to be more intelligent and accurate.