A gastrointestinal tract diagnosis system, at least comprising: an endoscope having a magnetic plate therein, the magnetic plate having a first magnetic pole and a second magnetic pole respectively distributed at a lower half portion and an upper half portion of the magnetic plate located along a thickness direction of the magnetic plate; and a magnetic control device including: a magnetic stick including a first electric magnetic pole at a terminal portion of the magnetic stick and a second electric magnetic pole located at a base portion of the magnetic stick; a magnetic force output module for being used to output a predetermined current to the magnetic stick so as to allow the magnetic stick to generate a predetermined current generating a predetermined magnetic force for interacting with the first magnetic pole and the second magnetic pole; characterized in, that the predetermined magnetic force is adapted to draw the magnetic plate to control the movement of the endoscope, and the magnetic plate is adapted to cause a feedback magnetic force to a sensor of the magnetic stick, converting the predetermined current into an offset current, and that the magnetic control device further includes a magnetic force feedback module, wherein the magnetic force feedback module is adapted to calibrate the offset current, resuming the offset current back to the predetermined current, so as to stabilize the predetermined magnetic force. an endoscope having a magnetic plate therein, the magnetic plate having a first magnetic pole and a second magnetic pole respectively distributed at a lower half portion and an upper half portion of the magnetic plate located along a thickness direction of the magnetic plate; and a magnetic control device including: a magnetic stick including a first electric magnetic pole at a terminal portion of the magnetic stick and a second electric magnetic pole located at a base portion of the magnetic stick; a magnetic force output module for being used to output a predetermined current to the magnetic stick so as to allow the magnetic stick to generate a predetermined current generating a predetermined magnetic force for interacting with the first magnetic pole and the second magnetic pole; characterized in, that a magnetic stick including a first electric magnetic pole at a terminal portion of the magnetic stick and a second electric magnetic pole located at a base portion of the magnetic stick; a magnetic force output module for being used to output a predetermined current to the magnetic stick so as to allow the magnetic stick to generate a predetermined current generating a predetermined magnetic force for interacting with the first magnetic pole and the second magnetic pole; characterized in, that the predetermined magnetic force is adapted to draw the magnetic plate to control the movement of the endoscope, and the magnetic plate is adapted to cause a feedback magnetic force to a sensor of the magnetic stick, converting the predetermined current into an offset current, and that the magnetic control device further includes a magnetic force feedback module, wherein the magnetic force feedback module is adapted to calibrate the offset current, resuming the offset current back to the predetermined current, so as to stabilize the predetermined magnetic force.