The invention relates to a flat-wind-grid double-layer roller bed transmission mechanism used for glass toughening. The roller bed transmission mechanism comprises lower roller beds used for transmitting glass, an electrical motor used for providing power for the lower roller beds, and a transmission component used for transmitting the power. Two ends of each of the lower roller beds are supported by lower-roller-bed bearing seats disposed on a supporting rack. An upper roller bed is disposed above each of the lower roller beds. Transmission of each of the upper roller beds is performed by a gear pair between the upper roller bed and the corresponding lower roller bed. Two ends of each of the upper roller beds are supported by upper-roller-bed bearing seats disposed on the supporting rack. A space between each of the upper roller beds and the corresponding lower roller bed is adjustable. The roller bed transmission mechanism overcomes restrictions of flat-wind-grid monolayer roller bed transmission mechanisms at present to adjustment of upper and lower wind grids, thus ensuring that the glass can be transmitted normally in the wind grids no matter how the upper and the lower wind grids are adjusted, and providing guarantee for a glass toughening technology of thin glass.