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. <EOS>