The invention relates to a fire escape device, comprising a movable window body and a main body provided with a window locker. The upper side of the movable window body is axially connected to a security window; a dropper and a waist span-type T-shaped safety belt are also arranged in the main body; U-shaped latch hooks are fixed at two sides of the dropper; two bearings are horizontally arranged in the dropper; a loose axle is arranged above the part between the two bearings; a long hand lever controls the loose axle to move up and down; a list of shafts are vertically arranged at one side of one shaft in two horizontal shafts; one end of a safety rope is fixed in the main body, and the other end thereof enters into the dropper, passes through the two horizontal shafts and then bends, extends from the dropper along a vertical shaft, and then is fixed on the dropper in a folding manner; a limited board is arranged on the upper part of the window locker; the limited board is connected with a T-shaped threaded rod and is operated by the hand lever; the limited board butts against the lower movable side of the movable window body. The fire escape device has the advantages that the escape passageway can be inaugurated rapidly, and the device corresponds with the structure of the existing window body; the operation is convenient; the safety is high.