The invention relates to the technology of wireless body area networks, and discloses a wireless body area network routing optimization method and device. The method comprises the steps that by abstracting the transmission channel rules of signals of a wireless body area network in various dynamic modes of human motion, effective characteristics corresponding to various action modes of the human body are extracted, and a mapping information base between the action modes of the human body and routing strategies is built; therefore, the wireless body area network can detect and identify the current action modes of the human body through human body sign parameters collected by sensors in real time, and according to the mapping information base, the sensors select the optimal routing strategies in real time to send the adopted sign parameters to sink nodes. Therefore, the workload of a processor is reduced effectively, a data processing process is accelerated, energy consumption of each sensor is reduced, work endurance time of each sensor is prolonged, and overall performance of the wireless body area network is promoted effectively.