Residual magnetism attraction force eliminating device of magnetic suction cup

The embodiment of the invention discloses a residual magnetism attraction force eliminating device of a magnetic suction cup. The device comprises a magnetic field detecting unit, an analog-digital conversion unit, a micro-control unit and an electromagnetic coil unit. The magnetic field detecting unit is used for detecting the magnetic field intensity between the magnetic suction cup and an adsorbed object and outputting an analog voltage signal in proportion with the magnetic field intensity. The analog-digital conversion unit is used for converting the analog voltage signal to a digital sampling signal. The micro-control unit is used for comparing the digital sampling signal with a set threshold value, and when the digital sampling signal is larger than the threshold value, a control signal for controlling the current direction and/or the impulse wave duty ratio of a power supply system to a power supply driving unit according to the size of the digital sampling signal. The electromagnetic coil unit is use