Abstract: An atmosphere regulator for coating and a coating apparatus on float glass production line are disclosed. Said atmosphere regulator for coating disposed between the district of lift out rolls and the A district of annealing lehr comprises a housing where a plurality of conveyor rolls which transfer sheet glass from said district of lift out rolls to the A district of said annealing lehr are installed, a curtain, an up-turning door and down-turning door are disposed at the joint where said district of lift out rolls and A district of annealing lehr connects. Said coating apparatus comprises a plurality of parallel base boards having a slot in between of the length corresponding to the width of said sheet glass and communicated with the entrance and the exhausting chamber. The present invention has effectively solved the drawbacks occurred in prior arts such as single function for coating, limited adjusting range of film thickness and bad film quality.