A foldable computer mouse, comprising: a first bottom plate and a second bottom plate; a first top plate, comprising a first end and a second end, wherein the first end pivots to a side of the first bottom plate away from the side of the first bottom plate where the second bottom plate is partially stacked on the first bottom plate; a second top plate, comprising a third end and a fourth end, wherein the fourth end pivots to a side of the second bottom plate away from the side of the second bottom plate where the first bottom plate is partially stacked under the second bottom plate; and two flexible side edge covers, connected to two side edges of the first top plate and the second top plate and two side edges of the first bottom plate and the second bottom plate, wherein the second bottom plate is located on the first bottom plate, and a part of the second bottom plate is stacked on the first bottom plate in a used state and in which the second bottom plate can be moved relative to the first bottom plate in a direction of approaching the first end of the first top plate, so that a larger part of the second bottom plate is stacked on the first bottom plate in a received state; and wherein the first top plate further comprises a first fastening structure disposed at the second end, and the second top plate further comprises a second fastening structure disposed at the third end, and the first fastening structure is suitable for fastening to the second fastening structure, so that the first top plate and the second top plate fixed together are in an arch shape in said used state; and wherein the first and second top plates can be rotated about the ends pivotally connected to the respective sides of the first and second bottom plates toward the first and second bottom plates in said received state. a first bottom plate and a second bottom plate; a first top plate, comprising a first end and a second end, wherein the first end pivots to a side of the first bottom plate away from the side of the first bottom plate where the second bottom plate is partially stacked on the first bottom plate; a second top plate, comprising a third end and a fourth end, wherein the fourth end pivots to a side of the second bottom plate away from the side of the second bottom plate where the first bottom plate is partially stacked under the second bottom plate; and two flexible side edge covers, connected to two side edges of the first top plate and the second top plate and two side edges of the first bottom plate and the second bottom plate, wherein the second bottom plate is located on the first bottom plate, and a part of the second bottom plate is stacked on the first bottom plate in a used state and in which the second bottom plate can be moved relative to the first bottom plate in a direction of approaching the first end of the first top plate, so that a larger part of the second bottom plate is stacked on the first bottom plate in a received state; and wherein the first top plate further comprises a first fastening structure disposed at the second end, and the second top plate further comprises a second fastening structure disposed at the third end, and the first fastening structure is suitable for fastening to the second fastening structure, so that the first top plate and the second top plate fixed together are in an arch shape in said used state; and wherein the first and second top plates can be rotated about the ends pivotally connected to the respective sides of the first and second bottom plates toward the first and second bottom plates in said received state.