The invention provides a method and a system for controlled sheet waiting of float glass. The method and the system are used in a float glass production line. The method comprises the following steps: obtaining the running information of every roller way and the position information of every piece of glass on the float glass production line; and transmitting the running information of a current roller way, the running information of a rear roller way, the position information of the glass on the current roller way and the position information of the glass on the rear roller way to a roller way control system in order to make the roller way control system control the running state of the current roller way according to the running information of the current roller way, the running information of the rear roller way, the position information of the glass on the current roller way and the position information of the glass on the rear roller way. The roller way control system controls the running state of the current roller way according to the running information of the current roller way, the running information of the rear roller way and the position information of the glass on the rear roller way, and solves the problem of the plate collision phenomenon caused by the stopping of the roller way in order to improve the product yield and the production stability.