The wiper comprises a wiping body and a handheld portion, the wiping body is triangular and comprises a top cover and a bottom cover which are connected in a clearance mode, a clamping frame is connected between the bottom cover and the top cover in a sliding mode, the bottom cover is provided with a first clamping portion, the top cover is provided with a second clamping portion, and the handheld portion is provided with a first clamping portion and a second clamping portion. When the top cover is pressed downwards, the first clamping part and the second clamping part are clamped, and the clamping frame is extruded by the oblique force of the top cover or the bottom cover to compress the first elastic piece, so that the clamping frame moves towards the center close to the bottom cover to clamp the wiping object; and when the first clamping part and the second clamping part are unclamped, the first elastic piece enables the clamping frame to move away from the center of the bottom cover so as to loosen the wiping object. When a wiping object on the wiper is disassembled and assembled, direct operation with hands is not needed, the operation is simple and convenient, time and labor are saved, the situation that the hands make contact with stains and germs on the wiping object is avoided, the triangular wiper can better adapt to the wiping surface with wiping dead corners, and the use experience feeling of a user is improved.