Test block for measuring refraction angle of ultrasonic probe

The invention discloses a test block for measuring the refraction angle of an ultrasonic probe. The test block is a semicircular test block, the test block is provided with a cylindrical surface, a rectangular surface and semicircular planes on the two sides, a radial cutting groove perpendicular to the rectangular surface is formed in the position, close to the semicircular planes, of the centerof the test block, and an angle ruler is marked on the arc edge of the test block. Due to the fact that the radial cutting groove is formed in the center of the test block, the incident point positionof the probe can be determined, and side wall interference formed by the semicircular plane of the test block to ultrasonic waves is reduced. The test block is provided with an angle scale, a refraction angle can be obtained according to the angle scale corresponding to the central position of the serial straight probe, and other size data do not need to be measured and then calculated; the method is simple in measurement