A digital ampere-turn instrument based on a single chip microcomputer provided by the invention belongs to the field of the electronic detector. The object of the invention is to divide a reference voltage into many parts by utilizing a multichannel AD through the single chip microcomputer so as to improve the detection precision of a reed switch. The digital ampere-turn instrument based on single chip microcomputer comprises a CPU processor, a lead screw motor, an image acquisition unit, a keyboard unit, an image storage unit and a voltage regulation unit. According to the invention, a detection system, consisting of a single chip microcomputer and a display unit, is designed so that the problems of the long detection period and the low detection precision of the reed switch detection device in the prior art are solved. The problem of the long detection period of the detection device is solved and at the same time each unit is integrated together in such a manner that the space is saved, the line connection is simple and easy and the operation is simple. The digital ampere-turn instrument is characterized by the combination of the single chip microcomputer and the high precision AD, improved detection precision, optimized simultaneous programs, reduced detection period and improved detection efficiency.