An SMA motor, comprising an upper component, a lower component, a plurality of bearings, and four SMA wires, wherein the lower component and the upper component are stacked, the plurality of bearings are located between the lower component and the upper component, one end of each bearing is fixedly connected to the lower component, and the other end is slidably connected to the upper component; one end of each SMA wire is fixedly connected to the upper component, the other end is fixedly connected to the lower component, the SMA wires shrink when being electrified and heated, the four SMA wires are divided into two pairs, the two pairs of SMA wires are symmetrically disposed relative to a first reference plane, two SMA wires of a same pair are symmetrically disposed relative to a second reference plane, and the second reference plane intersects with the first reference plane; and each bearing comprises a lubrication coating, wherein the lubrication coating is disposed at an end that is of the bearing and close to the upper component and is in contact with the upper component; wherein each bearing further comprises a bearing body, one end of the bearing body is fastened to the lower component, and the lubrication coating is fastened to the other end of the bearing body; characterized in that the lubrication coating comprises a metal layer, a metal inorganic compound layer, and an inorganic layer that are sequentially stacked, wherein the metal layer of the lubrication coating is fastened to the bearing body, the metal layer of the lubrication coating and the metal inorganic compound layer of the lubrication coating comprise a same element, and the metal inorganic compound layer of the lubrication coating and the inorganic layer of the lubrication coating comprise a same element. the lower component and the upper component are stacked, the plurality of bearings are located between the lower component and the upper component, one end of each bearing is fixedly connected to the lower component, and the other end is slidably connected to the upper component; one end of each SMA wire is fixedly connected to the upper component, the other end is fixedly connected to the lower component, the SMA wires shrink when being electrified and heated, the four SMA wires are divided into two pairs, the two pairs of SMA wires are symmetrically disposed relative to a first reference plane, two SMA wires of a same pair are symmetrically disposed relative to a second reference plane, and the second reference plane intersects with the first reference plane; and each bearing comprises a lubrication coating, wherein the lubrication coating is disposed at an end that is of the bearing and close to the upper component and is in contact with the upper component; wherein each bearing further comprises a bearing body, one end of the bearing body is fastened to the lower component, and the lubrication coating is fastened to the other end of the bearing body; characterized in that the lubrication coating comprises a metal layer, a metal inorganic compound layer, and an inorganic layer that are sequentially stacked, wherein the metal layer of the lubrication coating is fastened to the bearing body, the metal layer of the lubrication coating and the metal inorganic compound layer of the lubrication coating comprise a same element, and the metal inorganic compound layer of the lubrication coating and the inorganic layer of the lubrication coating comprise a same element.