Welding seam ultrasonic detection test block and calibration system

The invention provides a weld joint ultrasonic detection test block and a calibration system. The weld joint ultrasonic detection test block comprises a test block body and 2n transverse through holes, n transverse through holes are formed in the front surface of the test block body, the vertical distances between the transverse through holes and the upper surface of the test block body are gradually increased in sequence, and the n transverse through holes are the same in hole diameter and hole depth; corresponding to the n transverse through holes in the front surface, n transverse through holes are correspondingly formed in the rear surface of the test block body; a probe group presetting area and a probe group placing area are arranged at the two ends of the upper surface of the test block body respectively, so that a probe group moves from the probe group presetting area to the probe group placing area, all the transverse through holes are scanned in sequence, and scanning work is completed. According to