The invention discloses a wireless network maximum safety rate power distribution method based on direction modulation. The method comprises the following steps: establishing a direction modulation basic model; obtaining the safety rate of the channel according to the direction modulation basic model; constructing an artificial noise projection matrix and a useful information beam forming vector by adopting null-space projection; obtaining a maximum safety rate function related to the power distribution factor by combining the safety rate, the artificial noise projection matrix and the usefulinformation beam forming vector; and solving an optimal power distribution factor enabling the safety rate to be maximum according to the maximum safety rate function, thereby finishing maximum safetyrate power distribution. According to the method, the optimal power distribution factor is obtained by using the maximization safety rate criterion, the solving method is simpler, the effects of maximization of the signal-to-noise ratio in the expected direction and small signal-to-noise ratio in the unexpected direction can be achieved, and the method is suitable for any artificial noise projection matrix and the condition of given useful information beam forming vectors and is wide in application range.