The invention discloses an anti-fall device for height operation on transformers. The anti-fall device comprises two connectors used for being fixed on telegraph poles and cross rods or accessories of power transformers, and the connectors are connected through a steel rope. The connectors are hoops which comprise left half hoop pieces and right half hoop pieces, rotating nut safety buckles are arranged at the two ends of the left half hoop pieces and the two ends of the right half hoop pieces respectively, the two adjacent ends of the left half hoop pieces and the right half hoop pieces are fixed through combined locking screw rods arranged on the rotating nut safety buckles, and the rotating nut safety buckles between the adjacent ends of the left half hoop pieces and the right half hoop pieces are mutually parallel. According to the anti-fall device, a fixed point of a safety belt does not need to be changed, the operation efficiency is high, and the safety coefficient is high.