An improved double-string insulator UB hanging plate suspension device comprises U-shaped channel steel, UB hanging plates, suspension screws and a four-hole yoke plate. The improved double-string insulator UB hanging plate suspension device is characterized in that three holes are arranged in each of the two sides of the U-shaped channel steel with downward openings, the two holes in the upper part of each side are UB hanging plate connecting holes which are connected with the UB hanging plates through the two UB hanging plate suspension screws, one fixing hole is arranged in each side of theU-shaped channel steel and used for fixing screws to pass through, the U-shaped channel steel with the downward openings is buckled onto two pieces of back-to-back angle iron, bottom edges of the twosides of the U-shaped channel steel are in contact with the angle iron to bear the force, and the U-shaped channel steel are fixed by the fixing screws on the two pieces of back-to-back angle iron; and the four-hole yoke plate has two rows of holes in the top and bottom, the top row has two top holes which are connected with the UB hanging plates through U-shaped hanging rings, and the four-holeyoke plate are connected with two insulators. The beneficial effects are that the single UB hanging plate suspension in the past is changed into the two UB hanging plate suspension and the safety andreliability are improved.