The invention provides a realization method for a timeslice isolation-based power terminal multi-service communication access system. The method comprises the steps of constructing a communication system; processing the downlink signal of an optical line terminal; processing the signal of an optical network unit; processing the uplink signal of the optical line terminal and the like. According to the technical scheme of the invention, the effect of a timeslice isolation-based power terminal multi-service communication access system is realized. Based on the timeslice isolation-based power EPON communication system carrying multiple services, the services of the power system at different security level requirements and different isolation requirements can be carried by the same set of communication system. Therefore, the network construction cost is reduced, and the fiber occupation is lowered.