Cross-chip signal synchronization method and device and chip

The invention belongs to the technical field of signal synchronization, and provides a cross-chip signal synchronization method and device and a chip; a first chip is used as an execution main body, and the method comprises the following steps: sending a synchronization signal to a second chip according to a preset time, so that the second chip records a phase count value corresponding to a clocksignal of the second chip when receiving the synchronization signal, wherein the preset time is a phase count value corresponding to a clock signal of a first chip when the synchronization signal is sent; acquiring the synchronizing signal output to a pin of a first chip and feeding back the synchronizing signal to the first chip; and sending the phase count value of the first chip and the presettime to the second chip when the feedback synchronization signal is received, and thus, the second chip corrects the clock signal of the second chip according to the phase count value of the first chip, the predetermined time