A power tool according to the present invention comprising a working head including a working element, the working head is mounted on a first shaft with a first axis and can be rotated about the first axis, a gripping part, an adjusting mechanism connected between the working head and the gripping part, wherein the adjusting mechanism comprises at least a first transmission element and a second transmission element which are engaged with each other, the first transmission element is connected fixedly to the working head and mounted on the first shaft, the second transmission element is mounted on a hollow rod with an axis, the hollow rod can be rotated relative to the gripping part, a lock for collectively locking the angular position of the working head mounted on the hollow rod. The arrangement simplifies the structure of the power tool, while facilitating the adjusting operation. The user only needs to rotate the gripping part to adjust the trimming angular position without changing the original operation posture.