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Aiming at the problem of aggravated interference caused by the increasing number of devices, a transmitting power optimization algorithm is proposed, which combines the device association and beamwidth selection. In the premise of guaranteeing, the authenticity of millimeter wave (mmWave) application scenario, an mmWave device-to-device (D2D) network model is introduced, which integrates the roll off feature of Gaussian directional antenna model and the reflectivity of two-ray channel model. Specifically, the device association performed through distributed framework, and the beamwidth scheme optimized by the particle swarm optimization (PSO) algorithm, solve the non-convexity problem of transmitting power optimization in mmWave D2D networks. Simulation results indicate that, compared with the existing interference management algorithms which ignore the transmitting power of devices, the proposed algorithm can effectively reduce the transmitting power and interference, and the superior performance can be achieved.