The invention discloses a flat groove machine fixed-point operation workpiece fastening auxiliary device. The device comprises a machine body (1); the machine body (1) is provided with an angle measuring module (2), a fixing module (3), a distance induction module (4) and a management module (5); in operation, the angle measuring module (2) measures an angle condition between a workpiece and the machine body; the fixing module (3) fixes the workpiece; the distance induction module (4) induces a cutter operation distance; the management module (5) processes comprehensive information; the fixing module (3) is provided with a vibration test module (6) for performing vibration tests with different amplitudes for the fixed workpiece; a set module (7) is arranged on the distance induction module (4) for setting a reasonable numerical value range and a longest distance for workpiece operation; a prompt module (8) is arranged on the management module (5) for giving a prompt when inducing that the workpiece fixation or the operation distance is abnormal; and potential safety hazards are prevented through controlling the fastening degree of the workpiece.