The invention discloses a power optical network full-service load sensing method. The full-service load sensing method comprises the following steps of 1, obtaining data packet waiting time delay according to data packet information collected by an optical distribution node in combination with a queuing theory; 2, evaluating the link data flow state in the next period by combining a weighted moving average estimation mechanism; 3, obtaining the length of a cache queue according to the Little's law; 4, calculating a normalized link load through a range processing method; 5, counting the total utilization rate of the whole network bandwidth; 6, periodically updating the network state; 7, judging whether the network broadband utilization rate meets the service QoS request or not, executing the step 8 when the network broadband utilization rate meets the service QoS request, and otherwise, refusing to return to the step 6 by the access request; and step 8, obtaining accurate access of thedata packet, and distributing an appropriate route.