The invention provides a glass rotating conveying device and a glass piece laminating or separating conveying device. The glass rotating conveying device comprises a supporting part, a first conveying part, a second conveying part and a control system; the supporting part comprises a supporting seat and a supporting frame which is rotatably arranged on the supporting seat; the supporting frame is connected with a first driving mechanism; the first conveying part and the second conveying part are arranged on the supporting frame; each of the first conveying part and the second conveying part comprises a glass conveying belt and a second driving mechanism which is used for driving the glass conveying belt to operate bi-directionally; the conveying direction of the glass conveying belt of the first conveying part is perpendicular to the conveying direction of the glass conveying belt of the second conveying part; the control system comprises a controller, and detection sensors which are respectively arranged at the outer ends of the glass conveying belts; the first driving mechanism, the second driving mechanism and the detection sensors are all connected with the controller. According to the glass rotating conveying device and the glass piece laminating or separating conveying device, the glass direction changing efficiency is improved, and glass cannot be scratched in a direction changing process.