All-digital strip automatic photoelectric correction system,It includes a PLC controller (1), an amplifier (2), the master cylinder (3), uncoiler coil (4), the photodetector device (5), the photodetector device (5) for detecting unwinding machine reel (4 ) deviation, and signals by a / D converter (6) after the conversion input PLC regulator (1), PLC controller (1) the pulse signal input amplifier (2), the master cylinder (3) for controlling the unwinding machine reel (4) of the correction; photoelectric corrective system wherein: the amplifier (2) and the master cylinder (3) there are three four-way digital electro-hydraulic valve (7), an amplifier (2) generated by pulse current enter the three-way digital electro-hydraulic valve (7), pulse flow digital electro-hydraulic three-way valve (7) generated by the input master cylinder (3); the three-way digital electro-hydraulic valve (7) comprises a digital electro-hydraulic valve (7-1, 7-2), cartridge valve (8,9,10,11), the digital electro-hydraulic valve (7-1, 7-2) then imported oil pressure (P), respectively connected to the outlet cartridge valve (8,9,10,11) control oil on the road; cartridge valve (9, 10) is connected to the main oil line pressure oil passage (P), the outlet were connected to the master cylinder (3) around the oil chamber road; the road around the main oil import oil chamber cartridge valve (8, 11) is connected to the master cylinder (3), the outlet connected to the tank port (T) on. (12), a lever (13), and a disk electromagnet (14) which are connected to each other by a lever (13) ) Is connected to the valve body (12), one end of the push rod (16) being fixed to the disc (15) on the disc electromagnet (14) and connected to the lever (13).