The invention discloses a disc rotor and a disc motor. The disc rotor comprises a ring iron core which is provided with multiple sets of magnetic steel installing positions, wherein the magnetic steelinstalling positions are provided with buckle devices; magnetic steel which is installed in the magnetic steel installing positions and can be buckled in the magnetic steel installing positions by the buckle devices; a ring hoop which sleeves the outer circle of the ring iron core and is connected with the outer circumferential surface in an abutting way; and a rotor support which is provided with a ring boss which is inwardly sleeved in the inner circle of the ring iron core and connected with the inner circumferential surface in an abutting way, wherein the ring iron core is connected withthe rotor support through first screws. The ring iron core is fixed on the rotor support through the first screws and the rotor support axially limits the ring iron core so as to prevent axial displacement under the axial tension of the stator iron core. Besides, the buckle devices are arranged in the magnetic steel installing positions and the buckle devices can buckle the magnetic steel in the magnetic steel installing positions so as to prevent axial displacement of the magnetic steel.