Data Processing is an important issue in wireless sensor networks (WSNs). However, constrained energy will lead to the network life deeply affected by the power consumption of data processing. Hence, reducing the power consumption becomes an important objective to improve the performance of WSNs. In this paper, an energy-efficient data processing scheme (EED) is proposed to reach the goal of saving energy, which embeds the active energy saving approach of tuning data transmission power into the fairness queuing algorithm. Hence, in the proposed EED, the energy saving scheme in the system can find out the data deliver sequence with the minimum power consumption. Detailed simulation results show that, compared with existed schemes, the proposed EED can reduce the power consumption of transmission with consideration of the packet deliver sequence, which also improve the performance in terms of network lifetime, power consumption, fairness and throughput.