The invention provides a roller blind device for a greenhouse. The roller blind device for the greenhouse comprises a motor, a transmission shaft, a first universal joint, a stretchable rod, a second universal joint, a main shaft, an auxiliary shaft and a reeling shaft. The output end of the motor, the transmission shaft, the first universal joint, the stretchable rod, the second universal joint and the main shaft are connected in sequence, and the auxiliary shaft is connected with the main shaft and the reeling shaft through a non-parallel shaft gear pair. According to the roller blind device, torque is provided by the motor for the main shaft, the main shaft enables the torque to be transmitted to the reeling shaft through rotation of gears, a plastic thin film reels on the reeling shaft, and unreeling and reeling of a thin film roller blind for the greenhouse are electrically controlled. Meanwhile, the multiple universal joints are used in the roller blind device for compensating axial angle differences, the stretchable rod capable of transmitting the torque is further adopted to compensate the axial displacement, the reeling shaft of the roller blind device can depend on the outer contour of a greenhouse support in the reeling process to move, and the roller blind device is suitable for the roller blind of the greenhouse.