The invention relates to a virtual channel allocation method based on time division multiplexing in a wireless mesh network and belongs to the technical field of wireless communication. According to the method, each MAS time slot is divided into sub-time slots; the sub-time slots are numbered; and the sub-time slots with the same serial number in each MAS are taken as a group, called as a virtual channel. A two-hop node interference model is established, a graph coloring method is introduced, and the same virtual channel can be employed by links colored with the same color, at the same time. The virtual channels are allocated to the links in the network through graph coloring, and the nodes within two hops or out of the two hops are non-interfering, so the links out of the two hops of the links can employ the same virtual channel. Compared with an existing resource allocation problem in the existing mesh network, the method has the advantages that a utilization rate of the time slots is taken into full consideration, and according to the virtual multichannel allocation method based on the time division multiplexing, the network throughput is improved.