The utility model discloses a groove type permanent magnetic eddy current heating device which is applicable to convert wind energy into heat energy. Two bearings are fixed at the central position of the upper bottom and the central position of the lower bottom of a stator respectively, two rotor spindles pass through the bearings respectively, and a permanent magnetic rotor is fixed at ends of the two rotor spindles. The centre line of the permanent magnetic rotor and the centre line of the stator are on a same line. The distance between the permanent magnetic rotor outer wall and the stator inner wall is in the range of 0.1mm to 1.0mm. Axial grooves are distributed uniformly on the stator inner wall, wherein the width of each of the axial grooves is in the range of 1.0mm to 6.0mm, the depth of each of the axial grooves is in the range of 1.0mm to 6.0mm, and the distance between two neighboring axial grooves is in the range of 2.0mm to 50.0mm. The permanent magnetic eddy current heating device has the following effects: the structure of the stator is changed, a periodic high-frequency 'on-state and off-state' phenomenon is presented in the magnetic fields of permanent magnets, the rate of change of the magnetic fields in the stator is increased, a large electromagnetic induction eddy current can be generated in the stator which is a metal heating element, and the wind energy is converted into the heat energy.