The invention discloses an escape-ladder mounting seat achieving automatic opening and closing through sidesway. The escape-ladder mounting seat comprises a mounting seat body, an escape opening is formed in the middle of the mounting seat body, moving door sealing plates are arranged at positions, at the two sides of the escape opening, in the mounting body, the tail ends of the moving door sealing plates are connected with extensible driving mechanisms, and an alarming and sensing button is mounted at the position, at the front end of the corresponding extensible driving mechanism, in the mounting seat body; and the alarming and sensing buttons are fixedly arranged at the positions right behind the moving door sealing plates, a switch controller and an alarm apparatus are mounted on the end surface of one side of the mounting seat body, and door open buttons are arranged on the outer portions of the switch controllers in an embossed mode. According to the escape-ladder mounting seat achieving automatic opening and closing through sidesway, the escape opening in the mounting seat body can be opened rapidly and automatically, rapid escape of escaping people is facilitated, meanwhile, after the moving door sealing plates are opened, the alarming and sensing buttons are touched, and further alarm reminding is conducted.