Satellite internal equipment timing method and system

The invention provides a satellite internal equipment timing method and a satellite internal equipment timing system. The method comprises the steps that 1, a satellite host synchronizes a first frame pulse signal of a bus with a UTC (Coordinated Universal Time) sharp second moment, and timing information is triggered and sent by the UTC sharp second moment, wherein the timing information comprises signal waveform of the bus; 2, each slave equipment receives the timing information by the bus, time of detecting the first frame pulse signal of the timing information is locked, and timing is carried out by taking the time as a criterion; 3, when the salve equipment completes receiving the timing information, a second value of the timing information is written into a second time register, a timing value is written into a millisecond register, and timing from the satellite host to the salve equipment is completed. According to the method, the self waveform pulse of the bus is taken as a time PPS (Pulse Per Second) signal, the timing of the PPS signal is completed by a sending edge of the bus, the PPS signal is reduced, a connecting cable is reduced, the connection relation is simplified, the cost is reduced, precise timing is provided, and the reliability is increased.