The invention discloses a filling-type internal repair ball for dropping prevention of an external wall and belongs to the building field. The filling-type internal repair ball comprises a steel ball of a hollow structure, wherein the steel ball is wrapped with a rubber sleeve; the steel ball and the rubber sleeve are fixedly connected; the rubber sleeve is wrapped with a water-soluble thin film; the rubber sleeve and the water-soluble thin film are fixedly connected; adhesive fluff is adhered onto the outer side of the water-soluble thin film; external waterproof agent powder is attached onto the adhesive fluff; and an elastic balloon is arranged on the inner side of the steel ball and filled with mixed powder and dry nitrogen. The crack resistance of a bonding layer and an insulating layer is improved through adding the filling-type internal repair ball into the bonding layer and the insulating layer of the external wall, and meanwhile, after forming of cracking, the filling-type internal repair ball can perform repair inside to prevent cracks from expansion.