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In view of the problem of vision loss caused by the long-term use of electronic products by teenagers, an intelligent visual acuity protection instrument based on fuzzy control is proposed. The control system of the protector combines sensor technology, digital information processing technology, analog data processing technology, and an intelligent algorithm, and realizes the combination of software and hardware. Aiming at the problem that distance and illumination intensity are difficult to adjust in the detection process, a fuzzy control algorithm is introduced. The distance and illumination are adjusted by fuzzy control rules. The simulation experiment is carried out. The collected illumination intensity and detection distance are taken as input and timing time as output quantity to remind students. The results of the comparative experiments show that the time of fuzzy control is increased by 10.6min and the relative time is 18.563% compared with PID control, which can create a better learning environment for students.