Automatic roller blind device for greenhouse and roller blind shaft of device

The utility model discloses an automatic roller blind device for a greenhouse and a roller blind shaft of the automatic roller blind device. The roller blind shaft is driven by a motor driving mechanism and comprises more than two hollow tubes which are axially abutted; between two adjacent hollow tubes in the roller blind shaft, an insert hole with a polygonal radial cross section is formed at the insert end of one hole tube, and a polygonal insert section in rotation stop fit with the inner wall of the insert hole is correspondingly arranged on another hollow tube connected with the hollow tube. The automatic roller blind device and the roller blind shaft thereof have the following advantages: friction between the insert ends of two adjacent hollow tubes can be avoided; each hollow tube of the roller blind shaft can be prevented from suffering from axial deviation; a polygonal insert structure increases the torque transfer area, improves the stability in torque transfer, and prolongs the torque transfer dis