A power tool , comprising: a tool main body comprising a first motor for outputting power to a tool attachment ; and a dust collecting device comprising: a fan ; a second motor for driving the fan to rotate so as to generate an absorbing force; a connecting assembly for detachably connecting the dust collecting device with the tool main body ; and a dust collecting housing connected movably with the connecting assembly in a front and rear direction; wherein the second motor comprises: a stator; and a rotor; and wherein the dust collecting housing is formed with: a first containing chamber for containing the fan ; and a second containing chamber for containing dust absorbed by the dust collecting device ; characterized in that : said rotor is capable of rotating relative to the stator about a first axis substantially perpendicular to the front and rear direction; the tool main body comprises a tool housing comprising a main handle for a user to grip so as to operate the tool main body and an auxiliary handle comprising a clamping portion for clamping on the tool housing ; wherein the auxiliary handle is detachably connected with the tool main body , and the connecting assembly is detachably connected with the auxiliary handle . a tool main body comprising a first motor for outputting power to a tool attachment ; and a dust collecting device comprising: a fan ; a second motor for driving the fan to rotate so as to generate an absorbing force; a connecting assembly for detachably connecting the dust collecting device with the tool main body ; and a dust collecting housing connected movably with the connecting assembly in a front and rear direction; a fan ; a second motor for driving the fan to rotate so as to generate an absorbing force; a connecting assembly for detachably connecting the dust collecting device with the tool main body ; and a dust collecting housing connected movably with the connecting assembly in a front and rear direction; wherein the second motor comprises: a stator; and a rotor; and a stator; and a rotor; and wherein the dust collecting housing is formed with: a first containing chamber for containing the fan ; and a second containing chamber for containing dust absorbed by the dust collecting device ; characterized in that : said rotor is capable of rotating relative to the stator about a first axis substantially perpendicular to the front and rear direction; the tool main body comprises a tool housing comprising a main handle for a user to grip so as to operate the tool main body and an auxiliary handle comprising a clamping portion for clamping on the tool housing ; wherein the auxiliary handle is detachably connected with the tool main body , and the connecting assembly is detachably connected with the auxiliary handle . a first containing chamber for containing the fan ; and a second containing chamber for containing dust absorbed by the dust collecting device ; characterized in that : said rotor is capable of rotating relative to the stator about a first axis substantially perpendicular to the front and rear direction; the tool main body comprises a tool housing comprising a main handle for a user to grip so as to operate the tool main body and an auxiliary handle comprising a clamping portion for clamping on the tool housing ; wherein the auxiliary handle is detachably connected with the tool main body , and the connecting assembly is detachably connected with the auxiliary handle . said rotor is capable of rotating relative to the stator about a first axis substantially perpendicular to the front and rear direction; the tool main body comprises a tool housing comprising a main handle for a user to grip so as to operate the tool main body and an auxiliary handle comprising a clamping portion for clamping on the tool housing ; wherein the auxiliary handle is detachably connected with the tool main body , and the connecting assembly is detachably connected with the auxiliary handle . <EOS>