The utility model discloses a combined electrical apparatus flange seal encapsulating detection device, the on -line screen storage device comprises a base, set up lift platform on the base, the last rotatory lifter that sets up of lift platform, the lifter top is passed through rotary mechanism and is set up the xarm, the xarm front end sets up diaxon cloud platform, the direction of diaxon cloud platform with the axle center of xarm is perpendicular, diaxon cloud bench top end sets up the telescopic link, the front end of telescopic link sets up perpendicular aligning gear, set up ultrasonic sensor on the perpendicular aligning gear, the side of telescopic link sets up glue -pouring machine through the support and constructs. The utility model discloses can adjust ultrasonic sensor's angle for the flange surface can be kicked into with vertical angle to the supersound compressional wave, utilizes encapsulating sealing region colloid ultrasonic compressional wave multiple reflection characteristic, and sealing region detects to the high -voltage composite apparatus encapsulating, thereby realizes detecting simultaneously at the encapsulating, judges and does not pack, does not come unstuck and the position and the area in intact region, thereby increase the quality of encapsulating.