The utility model relates to a movable curtain damper for a plate glass annealing lehr, which comprises an annealing lehr (5), wherein a crossbeam (4) is arranged in the annealing lehr and a group of movable baffles (2) are connected with the lower part of the crossbeam. The movable curtain damper is characterized in that two lifting lugs (1)are respectively arranged at the two ends of the crossbeam, a spindle (6) is fixedly connected between the two lifting lugs, a group of steel pipes (3) are pivoted on the spindle, and each steel pipe (3) is connected with the corresponding mobile baffle plate (2) below. The utility model has the benefits that, firstly, both the gaps between the movable baffles and between the movable baffles and the crossbeam are small, and the isolating effect of the movable curtain damper is excellent; secondly, the movable curtain damper is safe, durable and favorable for long-term use; thirdly, the manufacturing and assembly are convenient; lastly, the appearance is neat and attractive.