A single-phase brushless high-speed motor, comprising: an outer housing having a cylindrical structure with two open ends and a hollow interior; a stator assembly disposed within the outer housing and in detachable connection therewith; the stator assembly including two coil bobbins, in the central part of which a through hole is defined for connection, a stator coil wound around the outer surface of each coil bobbin where a coil-receiving recess is provided for receiving the stator coil, and a stator core disposed in the outer surface of the coil bobbins; the stator core being made from laminated silicon-steel sheets having a thickness of 0.2mm or less for reducing eddy-current loss of the motor, being used for magnetic conduction and constituting the magnetic circuit of the motor, and including two W-shaped core blocks, which are symmetrically disposed at two opposite ends of the coil bobbin and comprise tooth portions, two opposite ends of the tooth portions being provided with a first magnetic yoke and a second magnetic yoke that can be respectively inserted into the through hole; the tooth portions of the stator core being engaged with each other to form an inner hole of the stator; the cross section of the inner hole of the stator is composed of two opposing spline curves, the inner surface of the tooth portions having a cross section being a spline curve and connected by a plurality of points whose radii are gradually increased, and such a spline curve ensures that the air gap between the stator assembly and the rotor assembly gradually becomes larger; the first magnetic yoke and second magnetic yoke of the stator core being inserted into the through hole of the coil bobbins respectively from both sides; and the core blocks forming a ring-shaped structure as the stator assembly through the first magnetic yoke and the second magnetic yoke; and a rotor assembly disposed within the inner hole of the stator and comprising an integral bearing, one end of the integral bearing being connected to an impeller, and the other end being mounted around magnets, which form magnetic body having two poles; wherein a Printed Circuit Board assembly is mounted on the coil bobbins. an outer housing having a cylindrical structure with two open ends and a hollow interior; a stator assembly disposed within the outer housing and in detachable connection therewith; the stator assembly including two coil bobbins, in the central part of which a through hole is defined for connection, a stator coil wound around the outer surface of each coil bobbin where a coil-receiving recess is provided for receiving the stator coil, and a stator core disposed in the outer surface of the coil bobbins; the stator core being made from laminated silicon-steel sheets having a thickness of 0.2mm or less for reducing eddy-current loss of the motor, being used for magnetic conduction and constituting the magnetic circuit of the motor, and including two W-shaped core blocks, which are symmetrically disposed at two opposite ends of the coil bobbin and comprise tooth portions, two opposite ends of the tooth portions being provided with a first magnetic yoke and a second magnetic yoke that can be respectively inserted into the through hole; the tooth portions of the stator core being engaged with each other to form an inner hole of the stator; the cross section of the inner hole of the stator is composed of two opposing spline curves, the inner surface of the tooth portions having a cross section being a spline curve and connected by a plurality of points whose radii are gradually increased, and such a spline curve ensures that the air gap between the stator assembly and the rotor assembly gradually becomes larger; the first magnetic yoke and second magnetic yoke of the stator core being inserted into the through hole of the coil bobbins respectively from both sides; and the core blocks forming a ring-shaped structure as the stator assembly through the first magnetic yoke and the second magnetic yoke; and a rotor assembly disposed within the inner hole of the stator and comprising an integral bearing, one end of the integral bearing being connected to an impeller, and the other end being mounted around magnets, which form magnetic body having two poles; wherein a Printed Circuit Board assembly is mounted on the coil bobbins.