A wiper, comprising: a buckling seat ; at least one elastic arm , connected to the buckling seat , wherein the elastic arm comprises an end part and a bottom surface disposed on one side thereof, and a buckling hole is defined on the end part ; a scrapping strip , disposed on the bottom surface of the elastic arm ; at least one end sleeve , adapted to sheathe the end part of the elastic arm and longitudinally blocking the scrapping strip along the elastic arm , wherein the end sleeve comprises a buckling hook buckled with the buckling hole and at least one connecting unit , adapted to sheathe the elastic arm , and one side of the connecting unit covering the bottom surface of the elastic arm ; wherein the connecting unit comprises a bottom guiding rail disposed on another side thereof opposite to the one side covering the elastic arm , the bottom guiding rail is longitudinally extended along the connecting unit , the scrapping strip comprises a top guiding rail disposed on one side thereof, the top guiding rail is longitudinally extended along the scrapping strip and passes through the bottom guiding rail , and the end sleeve covers one end of the top guiding rail and one end of the bottom guiding rail to longitudinally block the connecting unit along the elastic arm ; characterized in that the elastic arm is two in number, the connecting unit and the end sleeve are correspondingly two in number, one end of each of the elastic arms is buckled with the buckling seat and the elastic arms are oppositely extended from the buckling seat , each of the connecting units is adapted to sheathe each of the elastic arm , one side of each of the connecting units is disposed with the bottom guiding rail , and the top guiding rail is sheathed in each of the bottom guiding rail . a buckling seat ; at least one elastic arm , connected to the buckling seat , wherein the elastic arm comprises an end part and a bottom surface disposed on one side thereof, and a buckling hole is defined on the end part ; a scrapping strip , disposed on the bottom surface of the elastic arm ; at least one end sleeve , adapted to sheathe the end part of the elastic arm and longitudinally blocking the scrapping strip along the elastic arm , wherein the end sleeve comprises a buckling hook buckled with the buckling hole and at least one connecting unit , adapted to sheathe the elastic arm , and one side of the connecting unit covering the bottom surface of the elastic arm ; wherein the connecting unit comprises a bottom guiding rail disposed on another side thereof opposite to the one side covering the elastic arm , the bottom guiding rail is longitudinally extended along the connecting unit , the scrapping strip comprises a top guiding rail disposed on one side thereof, the top guiding rail is longitudinally extended along the scrapping strip and passes through the bottom guiding rail , and the end sleeve covers one end of the top guiding rail and one end of the bottom guiding rail to longitudinally block the connecting unit along the elastic arm ; characterized in that the elastic arm is two in number, the connecting unit and the end sleeve are correspondingly two in number, one end of each of the elastic arms is buckled with the buckling seat and the elastic arms are oppositely extended from the buckling seat , each of the connecting units is adapted to sheathe each of the elastic arm , one side of each of the connecting units is disposed with the bottom guiding rail , and the top guiding rail is sheathed in each of the bottom guiding rail . <EOS>