The utility model discloses a hole detecting system relates to hole detection area for realize portably that the hole is that the axiality detects. This hole detecting system includes support, telescopic link, apart from detecting element and controller, locate the one end of telescopic link, the other end and the support rotatable coupling of telescopic link apart from detecting element, is connected apart from detecting element and controller electricity, the controller can be according to the centre of a circle position of the distance calculation measured workpiece that records apart from detecting element. Above -mentioned technical scheme for the axiality of hole system detects and becomes simple, and at the spot facing work in -process, the hole that can in time obtain the detection is that the axiality feeds back to the course of working, and then improves product quality.