The utility model provides a probe positioning support. The probe positioning support comprises a positioning block and at least two fixing supports, wherein the positioning block is provided with a positioning clamping groove, and the positioning clamping groove is used for fixing a probe and enabling the probe to point to one specific direction; and the fixing supports are arranged at two sides of the positioning block, the fixing supports are arc-shaped and are arranged in an encircling manner, fixed ends of the fixing supports are connected with the positioning block, and free ends of the fixing supports are arranged in a manner of encircling a pipeline. According to the utility model, the probe positioning support is fixed on a pipeline to be detected, an ultrasonic thickness measurement probe is accurately adhered to the surface of the pipeline, so that the detection direction of the ultrasonic thickness measurement probe is aligned to the pipeline, and the real wall thickness of the pipeline can be measured.