The invention relates to a cable assembly based on an aviation steering valve system. The cable assembly comprises two sockets, two stainless steel bellows, a three-way pipe, an elbow, a connecting flange, a high temperature lead, a twisted-pair shielding lead, a shielding net and a high-temperature-resistant heat shrinkable pipe. The two ends of the horizontal pipe of the three-way pipe are respectively connected with the two sockets through the two stainless steel bellows. The vertical pipe of the three-way pipe is a straight pipe. The straight pipe is connected with the connecting flange atthe corresponding position of a steering valve plug inside the aircraft through the elbow. The high temperature lead is externally is covered with the twisted-pair shielding lead to be arranged in the three-way pipe in a penetration way. The high temperature lead and the twisted-pair shielding lead are connected on the core spectrum of the two sockets and the steering valve plu., The twisted-pairshielded lead in the three-way pipe is sequentially covered with the shielding net and the high-temperature-resistant heat shrinkable pipe. The assembly meets the requirements of body installation space and novel laser welding technology and has high service performance and reliable welding structure.