A control device of an internal speed change device of a wheel hub for clutching operation comprising: a rod; a lever installed on the rod; the lever being connected to a controlling claw sliding block; the rod having a guiding groove which extends along a direction of a center axis of the rod; the lever being installed in the guiding groove of the rod and being capable of moving forwards or backwards axially; an electric sliding block installed on a lever sleeve, the lever sleeve serving to receive a back end of the lever; wherein a guiding notch is formed at an inner side of the lever sleeve, the back end of the lever extending into the guiding notch; the back end of the lever forming a teethed strip; wherein an installing hole is formed on the lever sleeve and the installing hole is connected to the guiding notch; the electric sliding block being installed in the installing hole; the electric sliding block having a teethed surface engaged to the teethed strip of the lever; the electric sliding block being installed with a second magnetic unit; an electric bushing located at an outer side of the lever sleeve; a controlling ring located at an outer side of the electric bushing; an inner side of the controlling ring being installed with a first magnetic unit; an outer side of the controlling ring being installed with a gear; and wherein the electric sliding block is rotatable; wherein the controlling ring, the electric sliding block, the lever and the controlling claw sliding block are configured such that, when the gear is driven to rotate by an external force, the controlling ring rotates synchronously, force of attraction or repulsion between the first magnetic unit of the controlling ring and the second magnetic unit of the electric sliding block drives the electric sliding block to rotate so as to drive the lever to move forwards or backwards axially, and moving of the lever drives the controlling claw sliding block to control clutching of the internal speed change device. a rod; a lever installed on the rod; the lever being connected to a controlling claw sliding block; the rod having a guiding groove which extends along a direction of a center axis of the rod; the lever being installed in the guiding groove of the rod and being capable of moving forwards or backwards axially; an electric sliding block installed on a lever sleeve, the lever sleeve serving to receive a back end of the lever; wherein a guiding notch is formed at an inner side of the lever sleeve, the back end of the lever extending into the guiding notch; the back end of the lever forming a teethed strip; wherein an installing hole is formed on the lever sleeve and the installing hole is connected to the guiding notch; the electric sliding block being installed in the installing hole; the electric sliding block having a teethed surface engaged to the teethed strip of the lever; the electric sliding block being installed with a second magnetic unit; an electric bushing located at an outer side of the lever sleeve; a controlling ring located at an outer side of the electric bushing; an inner side of the controlling ring being installed with a first magnetic unit; an outer side of the controlling ring being installed with a gear; and wherein the electric sliding block is rotatable; wherein the controlling ring, the electric sliding block, the lever and the controlling claw sliding block are configured such that, when the gear is driven to rotate by an external force, the controlling ring rotates synchronously, force of attraction or repulsion between the first magnetic unit of the controlling ring and the second magnetic unit of the electric sliding block drives the electric sliding block to rotate so as to drive the lever to move forwards or backwards axially, and moving of the lever drives the controlling claw sliding block to control clutching of the internal speed change device.