The utility model discloses an arrester detecting device, the device includes: the steelframe major structure to and fix on the steelframe major structure: mechanical transmission mechanism, manipulator, testing equipment, mechanical transmission mechanism includes: driving motor, pulley, driving motor is connected with the power, and steelframe major structure upper end is equipped with the horizontal slide rail, and in the pulley embedding slide rail, driving motor is connected with the pulley drive, and the pulley is connected with the manipulator, is equipped with on the steelframe major structure and treats the detection case, detects qualified case, detects unqualified case, has realized that arrester detection efficiency is higher, the better technological effect of security.