The invention provides a power distribution method of a cellular fixed-node access network. The power distribution method comprises the steps of initiating a network, distributing an equal power to each sub-node by a main node, and calculating receiving signal-to-noise ratios of all sub-nodes; setting a signal-to-noise ratio threshold, increasing the power of the sub-node of which the signal-to-noise ratio is lower than the threshold value so that the signal-to-noise ratio of the sub-node reaches the threshold; calculating the power of the sub-node after power increase; calculating the power of a next sub-node according to a power recurrence relation; calculating the signal-to-noise ratio according to the power of the sub-node, if the signal-to-noise ratio is smaller than the threshold, increasing the power of the sub-node so that the signal-to-noise ratio reaches the threshold, and repeatedly calculating the power of the sub-node after power increase. The power distribution method of the cellular fixed-node access network can effectively improve total network throughput in a cellular fixed-node accessing network scene.