The invention discloses a device for detecting the quality of a hole formed in a hole-digging cast-in-place pile. The device comprises a main scale and an auxiliary scale hinged to the middle of the main scale, wherein landing legs used for adjusting the main scale to be in a horizontal state are arranged on the two ends of the main scale respectively, one end of the auxiliary scale is hinged to the middle of the main scale, a landing leg used for adjusting the auxiliary scale to be in a horizontal state is arranged at the other end of the auxiliary scale, and a light beam emitter used for emitting light beams downwards vertically is suspended on the auxiliary scale. The device for detecting the quality of the hole formed in the hole-digging cast-in-place pile is simple in structure, convenient to use and free of the influence of airflow in hole in the pile during measurement, the complicated operation of lifting and putting down of a hammer is eliminated, the precision is high, and the speed is high.