A hedge trimmer, comprising: a blade assembly comprising a first blade and a second blade that perform a cutting function with relative motion; a housing formed with an accommodating cavity; a prime mover arranged inside the accommodating cavity; and a transmission device for realizing power transmission between the prime mover and the blade assembly to drive the first blade and the second blade to produce the relative motion; wherein the first blade comprises: a first body portion extending along a first straight line; and a plurality of first tooth portions configured to cut vegetation; the second blade comprises: a second body portion extending along a second straight line; and a plurality of second tooth portions configured to cut vegetation; wherein the first blade further comprises: a first connection assembly comprising a first driving portion connected with the transmission device to introduce a driving force output by the transmission device into the first blade and a first connecting portion connected with the first body portion to make the first body portion move with the first driving portion; the second blade further comprises: a second connection assembly comprising a second driving portion connected with the transmission device to introduce a driving force output by the transmission device into the second blade and a second connecting portion connected with the second body portion to make the second body portion move with the second driving portion, and wherein the first connecting portion and the first body portion form a detachable connection, and the second connecting portion and the second body portion form a detachable connection, wherein the first connecting portion is at least partially located outside the housing; characterized in that the hedge trimmer further comprises a stopper enabled to restrict the first body portion from being detached from the first connecting portion; the stopper has a limiting state that restricts the first body portion from being detached from the first connecting portion, and an unlocked state that allows the first body portion to be detached from the first connecting portion; the stopper is partially located inside the housing, and the stopper further comprises an operating portion located outside the housing, the operating portion being at least partially operable by an operator without opening the housing; and the detachable connection formed by first body portion and the first connecting portion is separable without opening the housing. a blade assembly comprising a first blade and a second blade that perform a cutting function with relative motion; a housing formed with an accommodating cavity; a prime mover arranged inside the accommodating cavity; and a transmission device for realizing power transmission between the prime mover and the blade assembly to drive the first blade and the second blade to produce the relative motion; wherein the first blade comprises: a first body portion extending along a first straight line; and a plurality of first tooth portions configured to cut vegetation; a first body portion extending along a first straight line; and a plurality of first tooth portions configured to cut vegetation; the second blade comprises: a second body portion extending along a second straight line; and a plurality of second tooth portions configured to cut vegetation; a second body portion extending along a second straight line; and a plurality of second tooth portions configured to cut vegetation; wherein the first blade further comprises: a first connection assembly comprising a first driving portion connected with the transmission device to introduce a driving force output by the transmission device into the first blade and a first connecting portion connected with the first body portion to make the first body portion move with the first driving portion; the second blade further comprises: a second connection assembly comprising a second driving portion connected with the transmission device to introduce a driving force output by the transmission device into the second blade and a second connecting portion connected with the second body portion to make the second body portion move with the second driving portion, and a second connection assembly comprising a second driving portion connected with the transmission device to introduce a driving force output by the transmission device into the second blade and a second connecting portion connected with the second body portion to make the second body portion move with the second driving portion, and wherein the first connecting portion and the first body portion form a detachable connection, and the second connecting portion and the second body portion form a detachable connection, wherein the first connecting portion is at least partially located outside the housing; characterized in that the hedge trimmer further comprises a stopper enabled to restrict the first body portion from being detached from the first connecting portion; the stopper has a limiting state that restricts the first body portion from being detached from the first connecting portion, and an unlocked state that allows the first body portion to be detached from the first connecting portion; the stopper is partially located inside the housing, and the stopper further comprises an operating portion located outside the housing, the operating portion being at least partially operable by an operator without opening the housing; and the detachable connection formed by first body portion and the first connecting portion is separable without opening the housing.