Glass reinforced plastic sound velocity calibration block

The utility model relates to a glass reinforced plastic sound velocity calibration block and belongs to the technical field of ultrasonic testing. The glass reinforced plastic sound velocity calibration block comprises a block body (1) made of glass reinforced plastic, and a row of round holes (2) equal in diameter and different in depth are formed in the bottom of the block body (1) and are sequentially deeper from left to right. The glass reinforced plastic sound velocity calibration block is reasonable in structure and ingenious in design and can be applied to ultrasonic testing of blades of wind driven generators.