Electromagnetic heating body, atomizer and electronic atomization device

The utility model relates to an electromagnetic heating body, an atomizer and an electronic atomization device. The electromagnetic heating body comprises a first area, a second area and a third area which are sequentially arranged in the axial direction of the electromagnetic heating body. The effective cross-sectional area of the first area and/or the third area is larger than that of the second area, magnetic field gathering at one end or two ends of the second area is facilitated, a strong magnetic field is formed in the second area through the gathered magnetic field, the temperature rising speed of the second area is increased, the preheating time is shortened, and the energy utilization rate is increased. The atomizer comprises a liquid storage cavity, an electromagnetic heating body and a liquid guiding body which is in liquid guiding communication with the liquid storage cavity and at least partially makes contact with the electromagnetic heating body. The electronic atomization device comprises an a