The invention discloses a magnet vortex energy saving speed controller. The problems that in the prior art, a speed controlling device is unstable in speed, low in adjusting precision, inconvenient to maintain and large in size are mainly solved. The magnet vortex energy saving speed controller comprises a shell assembly (3), a permanent magnet rotor (2) and a conductor rotor (4), and the permanent magnet rotor (2) and the conductor rotor (4) are arranged in the shell assembly (3) and coupled to each other. A sliding component (5) used for driving the conductor rotor (4) to do axial linear movement is arranged on the conductor rotor (4), and connected with a control component (6) controlling the sliding position of the sliding component (5). The permanent magnet rotor (2) is arranged on the shell assembly (3) through a conical roller bearing, the conductor rotor (4) is arranged on the shell assembly (3) through an involute spline shaft (8), and the involute spline shaft (8) is connected with the shell assembly (3) through a conical roller bearing. The magnet vortex energy saving speed controller has the advantages of being stable, precise and easy and convenient to maintain, saving energy and the like.