The invention discloses an intelligent overcurrent phase-failure protector of a distribution transformer. The intelligent overcurrent phase-failure protector is characterized by comprising a signal data acquisition circuit, a signal data calculation judgment circuit, a switch operating circuit and an optical terminal circuit. The signal data acquisition circuit acquires signal data from a distribution transformer device system, and the output of the signal data acquisition circuit is connected with the signal data calculation judgment circuit and the optical terminal circuit. The output of the signal data calculation judgment circuit is connected with the switch operating circuit and the optical terminal circuit. The switch operating circuit is connected with the optical terminal circuit. The optical terminal circuit is connected with an optical fiber communication cable circuit, and the optical fiber communication cable circuit is connected with a distribution network intelligent control center. The intelligent protector can be applied to carry out intelligent overcurrent phase-failure protection management in the running process of the distribution transformer by utilizing an advanced electronic technique; and when high/low voltage overcurrent and phase failure accidents generate in the running process of the distribution transformer, an overhaul staff can immediately reach the accident scene to overhaul, thus the accident processing time is shortened, the power supply quality is increased, and the corporation and social benefits are increased. Meanwhile, the intelligent overcurrent phase-failure protector disclosed by the invention also exerts the positive facilitation to the development of an intelligent technique of an electric distribution system.