The invention provides a sound wave method testing method for a tunnel surrounding rock loosening circle. The method comprises the following steps: drilling a test drill hole in tunnel surrounding rock, arranging the grouting type bags on the upper inner wall and the lower inner wall of the drilled hole, placing the hole sealing pipe in the drilled hole, forming a grout overflowing opening and a grout outlet in the outer wall of the hole sealing pipe, enabling a testing instrument to penetrate through the hole sealing pipe, injecting grout into the grouting type bags through the grout outlet,and after grout in the grouting type bags reaches specific strength, injecting the slurry through the grout overflowing opening, injecting water into the hole sealing pipe, after the whole drilled hole is filled with the water, using the water as a coupling agent, using a testing instrument to emit sound waves to tunnel surrounding rock of the tunnel surrounding rock, and determining the range ofthe tunnel surrounding rock loosening circle according to the change condition of the reflection wave velocity of the tunnel surrounding rock. Aiming at complex geology, high ground stress areas and loose and broken surrounding rocks, the invention provides the method for testing the loose circle of the tunnel surrounding rocks by the acoustic wave method, the water plugging effect is improved through the hole sealing pipe, and the hole protection section ensures the drilling stability.