The present invention discloses a train control and service network flow monitoring and enqueue management method. The method comprises: performing first-level token distribution of a flow monitor according to the size relation of the average flow arrival rate of AF subqueues and the flow arrival rate allowed by a current service level agreement; calculating redistribution quotas of spare tokens distributed to AF subqueues being deficient in token; distributing the spare tokens to the AF subqueues being deficient in token according to the redistribution quota of the AF subqueues being deficient in token; employing a time sliding window three-color marker to divide the arrival grouping of the AF subqueues into three colors, and calculating the average queue length of each color grouping according to the grouping quantities of different colors of each AF subqueue; and according to the minimum queue threshold and the maximum queue threshold corresponding to the arranged three-color groupings, calculating the probabilities of different color groupings entering BE queues according the setting maximum entering BE queue probability, and dividing the groupings into the AF subqueues and the BE queues according to the probability.