The invention discloses a phase synchronization device and method, relating to the technical field of communication, and aiming to solve the problem that an existing phase synchronization technology is complicated in system structure, high in power consumption and difficult to integrate. According to the scheme of the invention, a time-to-digital converter is used to measure a time interval between an input reference signal and a phase-synchronized signal in a previous phase synchronization period; a calculation circuit is used to calculate a first phase shift value and a second phase shift value according to a measurement result of the time-to-digital converter; a first phase shift circuit is used to perform first phase shift on a signal to be phase-shifted according to the first phase shift value; a second phase shift circuit is used to perform second phase shift on the signal to be phase-shifted according to the second phase shift value, and the signal subjected to second phase shift is a phase-synchronized signal in a current phase synchronization period; and a delay locked loop is used to lock signal delay time values of each delay unit in the time-to-digital converter and thesecond phase shift circuit. The scheme of the invention is suitable for performing phase synchronization on two signals.