A mop head, comprising: a mop head frame, which is formed by injection molding through a mold, the mold has a plurality of protruding portions by which a plurality of concave connecting portions are formed on a bottom surface of the mop head frame, each concave connecting portion includes a bottom opening, a closed roof portion, a side wall and a narrow connecting portion, wherein an upper surface of the mop head frame seals the mop head frame to form the closed roof portion, the side wall is disposed between the bottom opening and the closed roof portion, the narrow connecting portion includes a first set of protruding elements and a first hollow portion, and a concave accommodating portion is formed between the closed roof portion and the narrow connecting portion, wherein after the injection molding, the protruding portion presses against and passes through the first set of protruding elements and the second set of protruding elements to compulsively demold from the concave connecting portion, and a cleaning member having a punch-in portion, a squeeze-in portion and a non-squeeze-in portion, wherein a I-shaped punch presses the punch-in portion to enable the I-shaped punch with the width and thickness to pass through the first hollow portion and the second hollow portion such that the punch-in portion and the squeeze-in portion are squeezed into the concave accommodating portion, and then the I-shaped punch moves in an opposite direction to pass through the first hollow portion and the second hollow portion to draw back from the concave connecting portion, wherein the mop head is characterised in that: the narrow connecting portion further includes a second set of protruding elements and a second hollow portion in such a manner that, in sequence, the first set of protruding elements, the first hollow portion, the second set of protruding elements and the second hollow portion surround the side wall thereby enabling the first set of protruding elements and the second set of protruding elements, which are formed by injection molding to extend from the side wall toward a vertical axis of the concave connecting portion such that the first hollow portion is a hollow space neighboring between one side edge of the first set of protruding elements and one side edge of the second set of protruding elements, the second hollow portion is a hollow space neighboring between another side edge of the first set of protruding elements and another side edge of the second set of protruding elements, in which the first hollow portion is disposed opposite to the second hollow portion. a mop head frame, which is formed by injection molding through a mold, the mold has a plurality of protruding portions by which a plurality of concave connecting portions are formed on a bottom surface of the mop head frame, each concave connecting portion includes a bottom opening, a closed roof portion, a side wall and a narrow connecting portion, wherein an upper surface of the mop head frame seals the mop head frame to form the closed roof portion, the side wall is disposed between the bottom opening and the closed roof portion, the narrow connecting portion includes a first set of protruding elements and a first hollow portion, and a concave accommodating portion is formed between the closed roof portion and the narrow connecting portion, wherein after the injection molding, the protruding portion presses against and passes through the first set of protruding elements and the second set of protruding elements to compulsively demold from the concave connecting portion, and a cleaning member having a punch-in portion, a squeeze-in portion and a non-squeeze-in portion, wherein a I-shaped punch presses the punch-in portion to enable the I-shaped punch with the width and thickness to pass through the first hollow portion and the second hollow portion such that the punch-in portion and the squeeze-in portion are squeezed into the concave accommodating portion, and then the I-shaped punch moves in an opposite direction to pass through the first hollow portion and the second hollow portion to draw back from the concave connecting portion, wherein the mop head is characterised in that: the narrow connecting portion further includes a second set of protruding elements and a second hollow portion in such a manner that, in sequence, the first set of protruding elements, the first hollow portion, the second set of protruding elements and the second hollow portion surround the side wall thereby enabling the first set of protruding elements and the second set of protruding elements, which are formed by injection molding to extend from the side wall toward a vertical axis of the concave connecting portion such that the first hollow portion is a hollow space neighboring between one side edge of the first set of protruding elements and one side edge of the second set of protruding elements, the second hollow portion is a hollow space neighboring between another side edge of the first set of protruding elements and another side edge of the second set of protruding elements, in which the first hollow portion is disposed opposite to the second hollow portion.