A wearable human-machine interaction apparatus, a human-machine interaction system (10) and a human-machine interaction method. The human-machine interaction system (10) comprises an accelerometer (12), a magnetometer (13), a gyroscope (14) and a controller (15). If the magnetic field intensity, sensed by the magnetometer (13), of the earth is normal, the controller (15) processes data information about the magnetic field intensity, sensed by the accelerometer (12) and the magnetometer (13), of the earth, extracts and recognizes a control instruction input by an instruction input object, and then outputs the recognized control instruction. If the magnetic field intensity, sensed by the magnetometer (13), of the earth is abnormal, the controller (15) processes acceleration and angular velocity information, extracts and recognizes the control instruction input by the instruction input object, and then outputs the recognized control instruction. By means of the wearable human-machine interaction apparatus and the human-machine interaction system and method, higher control precision can be achieved, and an input of a simple or complex control instruction can be supported.
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