Wireless transmission has always been difficult for unattended transmission line monitoring in remote mountainous areas without 4G signal wiring, and it is even more difficult for image data with large data volume. This paper designs and implements an intelligent wireless image sensor network transmission system for high voltage transmission line monitoring, using the research and development of embedded technology and wireless sensor network technology to realize image transmission .on the basis of the traditional wireless sensor network, aiming at the large image data and easy to cause interference in the communication process, an adaptive data subcontracting protocol is designed according to the RSSI value of the receiving end signal strength; In order to optimize the transmission routing and increase the redundancy of the transmission system, an intelligent routing transmission protocol is designed. Experimental test and simulation results show that the adaptive data subcontracting protocol can adjust the subcontracting number adaptively according to different bit error rates, which reduces the probability of retransmission and improves transmission efficiency; The intelligent dynamic routing transmission protocol can quickly find the nearest 4G signal node, saving transmission time and energy loss. The hopping function reduces the transmission time and increases the redundancy of the transmission system, so as to achieve the design purpose.