The invention relates to an electromagnetically-driven rotary fluid self-deformation resistor applicable to an electronic or electric system. The electromagnetically-driven rotary fluid self-deformation resistor is characterized by mainly comprising a containing cavity, conducting liquid, a magnetic field, a resistor body 1 and a resistor body 2, wherein the conducting liquid is loaded in the containing cavity, and the volume of the conducting liquid is smaller than the effective volume of the containing cavity; the resistor body 1 is located in the center of the containing cavity, is in contact with the conducting liquid and is partially exposed to an unoccupied cavity of the containing cavity; the resistor body 2 is located in the containing cavity and is in contact with the conducting liquid; the resistor body 1 and the resistor body 2 form an electrical passage through the conducting liquid; the magnetic field has components in the vertical direction of the liquid level of the conducting liquid between the resistor body 1 and the resistor body 2. The electromagnetically-driven rotary fluid self-deformation resistor is simple in structure, low in cost, durable and less prone to damage.