The invention relates to the field of steel pipe nondestructive testing devices, in particular to a steel pipe nondestructive testing fixing device, which comprises a box body, a supporting structure,a clamping structure, a folding structure, a positioning structure, a limiting structure and a fixing structure. The supporting structure is mounted at the bottom end of the box body to achieve the effect of supporting the box body when the box body is used for nondestructive testing; the box body can be better attached to the surface of the steel pipe, so that movement of the box body is facilitated, and the detection precision is improved; the clamping structure is mounted at the bottom end of the box body in a matched manner, so that the detection head can be conveniently mounted and replaced; by means of folding structure, the assembly for placing the detector can be folded and stored, so that the device is convenient to use; the folding structure is simple in structure and convenientto use, can play a supporting role in use, can be prevented from automatically falling back after being lifted by being matched with the arrangement of the positioning structure, thus ensuring the stability of placing the detector. By means of the limiting structure, the arrangement assembly for placing the detector can be conveniently supported, retracted and stored.