The utility model discloses an arc light probe fixing member. The arc light probe fixing member comprises a pedestal, a steering lever and a steering plate, wherein the pedestal and the steering lever are tightly locked together through a locking device, the steering lever can rotate around the pedestal along any directions and is locked with the steering plate through another locking device, the steering plate can rotate within the plane where the steering lever is disposed, and an arc light probe is fixed on the steering plate. According to the arc light probe fixing member provided by the utility model, two rotating mechanisms are adopted, rotation in three-dimensional space is realized, the probe can be parallel with any plane after rotation, and thus the arc light probe is guaranteed to point to any direction in the space after the rotation of the steering members. With adoption of the arc light probe fixing member provided by the utility model, the fixing member does not need to be changed in position or reassembled when structures in the space changes, the disadvantages that the conventional arc light probe fixing member cannot flexibly steer and that the fixing member has to change as long as the space arrangement changes are overcome, and the defect that the fixing member needs to be reassembled when positions in need for detection change within the same space is overcome.