The invention discloses an internal thread detection device and a tapping and detecting production line with the internal thread detection device. According to the invention, the manual internal thread detection standard is imitated, vertical air cylinders and a rotating motor are utilized for driving a go-no go plug gauge to do vertical and rotating motion for detection, and meanwhile three vertical photoelectric sensors and a rotating photoelectric sensor are utilized for sensing the detection progress of the go-no go plug gauge. The tapping and detecting integrated full-automatic production line composed of a rotating indexing disc, first blowing cleaning devices, a height detecting device, a tapping device, a second blowing cleaning device, a thread detecting device, a combination control system and an operation system is adopted, wherein the first blowing cleaning devices, the height detecting device, the tapping device, the second blowing cleaning device and the thread detecting device are sequentially and annularly arranged above the indexing disc according to the operation procedure. Thus, the complete-set production process of incoming machining material detecting, workpiece cleaning, workpiece thread machining, thread forming condition acceptance testing and the like can be completed through one machine and one person; and the aims of greatly improving the production efficiency, reducing the man hour, obtaining multi-ability workers and downsizing the staff to improve the efficiency are achieved.