A power tool (100, 200), comprising: a housing (11,201) formed with a main handle configured for being held by a user; a motor arranged inside the housing (11,201) and comprising a driving shaft; a working head comprising an output shaft and an abrasive disc connected to the output shaft, wherein the output shaft is driven by the motor; and a transmission assembly configured for transmitting power between the driving shaft and the output shaft; wherein that the power tool (100, 200) further comprises: an auxiliary handle (20, 202), comprising: a front end mounted onto the housing (11,201) at a position adjacent to the working head; a gripping portion extending along a center line; a vibration damping assembly comprising at least one mass member and a plurality of elastic elements; and an end cap arranged at a rear end of the gripping portion; wherein the rear end is farther away from the housing (11,201) relative to the front end, the end cap defines an accommodating cavity configured for accommodating at least part of the vibration damping assembly, and the plurality of elastic elements are arranged between the at least one mass member and a cavity wall of the accommodating cavity; characterized in that the end cap is detachably connected to the rear end of the gripping portion. a housing (11,201) formed with a main handle configured for being held by a user; a motor arranged inside the housing (11,201) and comprising a driving shaft; a working head comprising an output shaft and an abrasive disc connected to the output shaft, wherein the output shaft is driven by the motor; and a transmission assembly configured for transmitting power between the driving shaft and the output shaft; wherein that the power tool (100, 200) further comprises: an auxiliary handle (20, 202), comprising: a front end mounted onto the housing (11,201) at a position adjacent to the working head; a gripping portion extending along a center line; a vibration damping assembly comprising at least one mass member and a plurality of elastic elements; and an end cap arranged at a rear end of the gripping portion; wherein the rear end is farther away from the housing (11,201) relative to the front end, the end cap defines an accommodating cavity configured for accommodating at least part of the vibration damping assembly, and the plurality of elastic elements are arranged between the at least one mass member and a cavity wall of the accommodating cavity; characterized in that the end cap is detachably connected to the rear end of the gripping portion. a front end mounted onto the housing (11,201) at a position adjacent to the working head; a gripping portion extending along a center line; a vibration damping assembly comprising at least one mass member and a plurality of elastic elements; and an end cap arranged at a rear end of the gripping portion; wherein the rear end is farther away from the housing (11,201) relative to the front end, the end cap defines an accommodating cavity configured for accommodating at least part of the vibration damping assembly, and the plurality of elastic elements are arranged between the at least one mass member and a cavity wall of the accommodating cavity; characterized in that the end cap is detachably connected to the rear end of the gripping portion.