The invention belongs to the technical field of escape, and particularly relates to a building straight jumping type escape mechanism. The building straight jumping type escape mechanism comprises a driving mechanism, second C-shaped springs, footboards, triangular blocks, triggering blocks, limiting plates, second fixing plates, first fixing plates, propping plates, damping wheel mechanisms, first C-shaped springs, driving gears, first limiting bars, second limiting bars, first rack plates and second rack plates. Trapped personnel step on the footboards, the downward-pressed footboards allowthe driving gears to be engaged with the first rack plates, then the driving gears drive sliding plates to slide out of sliding plate grooves via the first rack plates, and then the trapped personnelstride on the sliding plates from the footboards, and finally straight jump to escape air bag cushions from the sliding plates for escape, so that the escape time of the trapped personnel compared with that in a traditional escape stairway is shortened and the escape probability of the trapped personnel is raised substantially. The building straight jumping type escape mechanism is simple and hasa good safe using effect.