The embodiment of the invention provides a high-voltage protection device for a distribution transformer. The high-voltage protection device comprises a three-phase magnetic latching switch, wherein afirst end of the three-phase magnetic latching switch is connected with a high-voltage bushing; a second end of the three-phase magnetic latching switch is connected with a high-voltage coil lead ofa distribution transformer body; and the three-phase magnetic latching switch is arranged in an oil tank of the distribution transformer and is used for releasing a load switch in the three-phase magnetic latching switch when detecting that the temperature of the distribution transformer and/or the oil temperature of the oil tank of the distribution transformer are greater than a preset temperature value. According to the high-voltage protection device, the protection range of the distribution transformer can be expanded, the problem that a contact is exposed is avoided, and the problems, suchas external force and foreign matter invasion and corrosion can be solved, thereby improving the security and the reliability of high-voltage protection of the distribution transformer.