A rotating device, comprising: an annular base; a first positioning member pivoted to a peripheral portion of the annular base, the first positioning member comprising a first stop portion and a second stop portion connected to the first stop portion, the first stop portion being bent in a first rotating direction, and the second stop portion being bent in a second rotating direction; a second positioning member pivoted to the peripheral portion of the annular base, the second positioning member comprising a third stop portion and a fourth stop portion connected to the third stop portion, the third stop portion being bent in the first rotating direction, and the fourth stop portion being bent in the second rotating direction; and a driving member rotatably assembled to the annular base, wherein the driving member comprises a pushing structure, a pivot shaft and an extending portion, the pivot shaft is rotatably pivoted to the annular base, one end of the extending portion is connected to the pivot shaft, and the other end is connected to the pushing structure, the pushing structure protrudes from the peripheral portion, and the driving member is driven by a force (F1, F2, F3, F4) to drive the pushing structure to rotate around the outer edge of the peripheral portion in the first rotating direction or the second rotating direction; when the pushing structure rotates in the first rotating direction, the first stop portion and the third stop portion fit the peripheral portion in response to the push of the pushing structure, and the second stop portion and the fourth stop portion stop the pushing structure; and when the pushing structure rotates in the second rotating direction, the second stop portion and the fourth stop portion fit the peripheral portion in response to the push of the pushing structure, and the first stop portion and the third stop portion stop the pushing structure. an annular base; a first positioning member pivoted to a peripheral portion of the annular base, the first positioning member comprising a first stop portion and a second stop portion connected to the first stop portion, the first stop portion being bent in a first rotating direction, and the second stop portion being bent in a second rotating direction; a second positioning member pivoted to the peripheral portion of the annular base, the second positioning member comprising a third stop portion and a fourth stop portion connected to the third stop portion, the third stop portion being bent in the first rotating direction, and the fourth stop portion being bent in the second rotating direction; and a driving member rotatably assembled to the annular base, wherein the driving member comprises a pushing structure, a pivot shaft and an extending portion, the pivot shaft is rotatably pivoted to the annular base, one end of the extending portion is connected to the pivot shaft, and the other end is connected to the pushing structure, the pushing structure protrudes from the peripheral portion, and the driving member is driven by a force (F1, F2, F3, F4) to drive the pushing structure to rotate around the outer edge of the peripheral portion in the first rotating direction or the second rotating direction; when the pushing structure rotates in the first rotating direction, the first stop portion and the third stop portion fit the peripheral portion in response to the push of the pushing structure, and the second stop portion and the fourth stop portion stop the pushing structure; and when the pushing structure rotates in the second rotating direction, the second stop portion and the fourth stop portion fit the peripheral portion in response to the push of the pushing structure, and the first stop portion and the third stop portion stop the pushing structure.