The invention provides a dynamical combined type piano key sheet blanking control system and a method thereof and relates to the technical field of production of glass. The control system comprises aplurality of piano keys in a piano key sheet blanking device and electromagnetic valves which are correspondingly connected with piano keys, wherein the system also comprises a control module; the control module is used for marking a coordinate range of glass according to a cutting mark coordinate of a cutting system, marking a coordinate range of each piano key according to width and spacing distance of the piano keys by taking a zero point of the cutting system as reference, successively comparing the coordinate range of the glass with the coordinate ranges of the piano keys, generating corresponding control signals when folded parts exist and controlling the electromagnetic valves connected with the piano keys corresponding to the folded parts so as to control the piano keys to performsheet blanking actions. The control system and the method are capable of automatically controlling the piano keys to perform the sheet blanking actions without manual intervention when changing glasscutting schemes or glass cutting specifications; the glass loss can be effectively reduced; the control system and the method can be implemented without the need of adding hardware components; the control cost can be effectively reduced; and the control system and the method have good economic benefits.