An optical element driving mechanism, comprising: a fixed assembly; a first movable assembly, movable relative to the fixed assembly and configured to be connected to a photosensitive element, wherein the photosensitive element corresponds to an optical element; and a first driving assembly, configured to drive the first movable assembly to move relative to the fixed assembly; wherein the first movable assembly includes a substrate configured to support the photosensitive element; wherein the fixed assembly includes a base plate, and a gap (1-G) is formed between the substrate and the base plate; wherein the substrate includes a plurality of movable cantilevers, extending in a direction perpendicular to a main axis of the fixed assembly; wherein the substrate includes a main body, each of the movable cantilevers has a first end portion and a second end portion, respectively connected to the main body and the base plate, and there is a distance between the first end portion and the second end portion in the main axis; wherein the first movable assembly includes a heat dissipation structure corresponding to the first driving assembly, the optical element or the photosensitive element; wherein the heat dissipation structure is formed on a bottom surface of the substrate; characterized in that the first driving assembly includes a plurality of first driving magnetic elements (1-MG1) and plurality of first driving coils (1-CL1) which are correspondingly disposed on a plurality of sides of the substrate; wherein the fixed assembly further includes a plurality of supporting elements disposed on the base plate, and the supporting elements are configured to support the substrate; and each of the supporting elements has an arc surface that contacts the bottom surface of the substrate. a fixed assembly; a first movable assembly, movable relative to the fixed assembly and configured to be connected to a photosensitive element, wherein the photosensitive element corresponds to an optical element; and a first driving assembly, configured to drive the first movable assembly to move relative to the fixed assembly; wherein the first movable assembly includes a substrate configured to support the photosensitive element; wherein the fixed assembly includes a base plate, and a gap (1-G) is formed between the substrate and the base plate; wherein the substrate includes a plurality of movable cantilevers, extending in a direction perpendicular to a main axis of the fixed assembly; wherein the substrate includes a main body, each of the movable cantilevers has a first end portion and a second end portion, respectively connected to the main body and the base plate, and there is a distance between the first end portion and the second end portion in the main axis; wherein the first movable assembly includes a heat dissipation structure corresponding to the first driving assembly, the optical element or the photosensitive element; wherein the heat dissipation structure is formed on a bottom surface of the substrate; characterized in that the first driving assembly includes a plurality of first driving magnetic elements (1-MG1) and plurality of first driving coils (1-CL1) which are correspondingly disposed on a plurality of sides of the substrate; wherein the fixed assembly further includes a plurality of supporting elements disposed on the base plate, and the supporting elements are configured to support the substrate; and each of the supporting elements has an arc surface that contacts the bottom surface of the substrate.