A wiper structure, comprising: a main wiper frame, comprising a fixing seat; a pair of secondary wiper frame, connected to two ends of the main wiper frame, each secondary wiper frame comprising a flexible sheet, the flexible sheet comprising multiple sliding troughs, each sliding trough comprising a trough length and a trough width in size, and the trough length greater than the trough width; multiple engaging frames, evenly disposed on each secondary wiper frame, each engaging frame comprising a pressing wing and a sliding block, the pressing wing comprising an opening, the sliding block comprising a neck bar passing through the opening, the neck bar comprising a passing diameter (d), the passing diameter (d) less than the trough width, the sliding block of each engaging frame passing through the opening and abutting against each sliding trough through the neck bar; and a blade, connected under the pressing wings, characterized in that: the passing diameter (d) is less than the trough width by at least 0.2 mm, wherein the sliding block is slidable in each sliding trough with respect to a change of an external force exerted on corresponding one of the secondary wiper frames; the pressing wing comprises an indented angle defined at a position of the opening and a slant angle defined at two distal ends thereof respectively, and the indented angle and the slant angle are between 170 degrees and 180 degrees respectively; and the flexible sheet comprises a bending angle defined at a middle portion thereof and an extending angle defined at two distal ends thereof, and the bending angle and the extending angle are between 160 degrees and 175 degrees respectively. a main wiper frame, comprising a fixing seat; a pair of secondary wiper frame, connected to two ends of the main wiper frame, each secondary wiper frame comprising a flexible sheet, the flexible sheet comprising multiple sliding troughs, each sliding trough comprising a trough length and a trough width in size, and the trough length greater than the trough width; multiple engaging frames, evenly disposed on each secondary wiper frame, each engaging frame comprising a pressing wing and a sliding block, the pressing wing comprising an opening, the sliding block comprising a neck bar passing through the opening, the neck bar comprising a passing diameter (d), the passing diameter (d) less than the trough width, the sliding block of each engaging frame passing through the opening and abutting against each sliding trough through the neck bar; and a blade, connected under the pressing wings, characterized in that: the passing diameter (d) is less than the trough width by at least 0.2 mm, wherein the sliding block is slidable in each sliding trough with respect to a change of an external force exerted on corresponding one of the secondary wiper frames; the pressing wing comprises an indented angle defined at a position of the opening and a slant angle defined at two distal ends thereof respectively, and the indented angle and the slant angle are between 170 degrees and 180 degrees respectively; and the flexible sheet comprises a bending angle defined at a middle portion thereof and an extending angle defined at two distal ends thereof, and the bending angle and the extending angle are between 160 degrees and 175 degrees respectively. the passing diameter (d) is less than the trough width by at least 0.2 mm, wherein the sliding block is slidable in each sliding trough with respect to a change of an external force exerted on corresponding one of the secondary wiper frames; the pressing wing comprises an indented angle defined at a position of the opening and a slant angle defined at two distal ends thereof respectively, and the indented angle and the slant angle are between 170 degrees and 180 degrees respectively; and the flexible sheet comprises a bending angle defined at a middle portion thereof and an extending angle defined at two distal ends thereof, and the bending angle and the extending angle are between 160 degrees and 175 degrees respectively.