Carrying 5G enhanced mobile broadband(eMBB) services and ultra-reliable low-latency communication (uRLLC) services based on passive optical network(PON) systems is the current research focus of optical and wireless access networks. How to meet the low-latency requirements of different services has become an urgent problem to be solved in the PON system. In this paper, a low-latency bandwidth allocation algorithm for Xhaul network which supports multi-service coexistence is proposed. By allocating guaranteed bandwidth for uRLLC traffic and prioritizing bandwidth allocation for fronthaul eMBB traffic, at the same time sacrificing the priority of midhaul eMBB traffic and reducing system bandwidth efficiency, to reduce the delay of uRLLC traffic and fronthaul eMBB traffic in this system. When option 2 is selected at the high level and option 6, option 7-3 and option 7-2 are respectively selected at the low level, Matlab software is used to simulate the delay under low load. The simulation results show that the three low-level function partitioning methods can meet the delay requirement of 0.25 ms, and the average delay and maximum delay of the algorithm under high load are lower than those of the algorithm in reference <参考文献原文>.