A neuro electrical stimulation system, comprising an extension wire and a lead connected to the extension wire, wherein the extension wire is provided with a channel, and the lead is inserted into the channel and abutted with the extension wire, a fixing assembly is arranged in the channel and configured to restrict the lead to move in the channel; wherein the fixing assembly comprises a fixing block at least partially embedded in the channel, and a fixing member capable of being locked into the fixing block, the fixing block is provided with a receiving hole, the receiving hole penetrates through the fixing block and is configured for the lead to pass through, two ends of the receiving hole are each in communication with the channel, the fixing block is provided with a fixing hole that is in communication with the receiving hole, the fixing member is at least partially inserted into the receiving hole through the fixing hole, and configured to, after said fixing member is inserted into the fixing block, clamp the lead with the fixing block; wherein the fixing member comprises a locking portion and a protruding portion, the locking portion is fitted with the fixing block to realize locking between the fixing member and the fixing block; wherein the neuro electrical stimulation system is characterized in that, the protruding portion is formed by protruding outwards from one end of the locking portion, the protruding portion is at least partially located in the receiving hole and is movable in the receiving hole, and the fixing member is configured to clamp the lead with the fixing block through the protruding portion, the locking portion and the protruding portion are integrally formed, the fixing hole includes a locking hole for the locking portion to be inserted therein and locked, and a receiving cavity for receiving the protruding portion; wherein the fixing block is further provided with a mounting hole that is in communication with the receiving hole, the mounting hole and the fixing hole are coaxially and oppositely arranged on two sides of the receiving hole, the mounting hole has a diameter not smaller than a diameter of the protruding portion, and an axis in which the mounting hole is located intersects with an axis in which the receiving hole is located; the fixing member is configured to be moved into the fixing hole through the mounting hole and to be locked to the fixing hole. wherein the fixing assembly comprises a fixing block at least partially embedded in the channel, and a fixing member capable of being locked into the fixing block, the fixing block is provided with a receiving hole, the receiving hole penetrates through the fixing block and is configured for the lead to pass through, two ends of the receiving hole are each in communication with the channel, the fixing block is provided with a fixing hole that is in communication with the receiving hole, the fixing member is at least partially inserted into the receiving hole through the fixing hole, and configured to, after said fixing member is inserted into the fixing block, clamp the lead with the fixing block; wherein the fixing member comprises a locking portion and a protruding portion, the locking portion is fitted with the fixing block to realize locking between the fixing member and the fixing block; wherein the neuro electrical stimulation system is characterized in that, the protruding portion is formed by protruding outwards from one end of the locking portion, the protruding portion is at least partially located in the receiving hole and is movable in the receiving hole, and the fixing member is configured to clamp the lead with the fixing block through the protruding portion, the locking portion and the protruding portion are integrally formed, the fixing hole includes a locking hole for the locking portion to be inserted therein and locked, and a receiving cavity for receiving the protruding portion; wherein the fixing block is further provided with a mounting hole that is in communication with the receiving hole, the mounting hole and the fixing hole are coaxially and oppositely arranged on two sides of the receiving hole, the mounting hole has a diameter not smaller than a diameter of the protruding portion, and an axis in which the mounting hole is located intersects with an axis in which the receiving hole is located; the fixing member is configured to be moved into the fixing hole through the mounting hole and to be locked to the fixing hole.