The invention discloses a low-power-consumption on-chip network task mapping method. The low-power-consumption on-chip network task mapping method comprises the following steps of S10, building an on-chip network topology model, S11, building a multi-task model, S12, determining constraint conditions, S13, setting up a mapping set, and S14, carrying out mapping between tasks and an on-chip network. According to the low-power-consumption on-chip network task mapping method, due to the facts that the model is built for the tasks in the on-chip network, the relation among the tasks is analyzed, and then the tasks are mapped through dual constraint conditions including communication delay and energy consumption, mapping efficiency is improved, and power consumption of mapping is reduced.