The invention relates to the technical field of greenhouse equipment, and especially relates to a control system for a greenhouse roller shutter device, and a control method. The control system for a greenhouse roller shutter device comprises: roller shutters of the roller shutter device arranged on a shed surface of a greenhouse, an environment factor obtaining device, and a control platform. The roller shutters can spread downward from the top of the shed surface, or roll upward from the bottom of the shed surface. A driving mechanism is connected with the roller shutters. The top and the bottom of the shed surface are respectively provided with a limiting contact breaking switch. The environment factor obtaining device is arranged in the greenhouse, and is used to obtain environment factor data in the greenhouse. The control platform is used to analyze the environment factor data in the greenhouse, the environment factor data being obtained by the environment factor obtaining device, and control the driving mechanism to drive the roller shutters to spread or roll up according to an analysis result. The control system for a greenhouse roller shutter device and the control method can automatically control spreading and roll-up processes of the roller shutters, and can obtain environment factor data in the greenhouse, so as to effectively improve monitoring intensity on the environment factors in the greenhouse.