The utility model discloses an automatic sitting and standing conversion mechanism applied to a walking aid device, and relates to the technical field of electric walking aid, the automatic sitting and standing conversion mechanism comprises a long connecting rod, the side wall of the long connecting rod is connected with a movable rod I, the side wall of the movable rod I is connected with a supporting
crutch, and the side wall of the supporting
crutch is connected with a seat plate. A long connecting rod, a short connecting rod, a movable rod, a telescopic rod, a control telescopic block and a movable main rod are integrally arranged for main matched movable use, the long connecting rod drives the movable rod I to move when conversion use is needed, the movable rod I drives the seat plate to move, and then up-and-down movement conversion is conducted through a telescopic
pipe and the telescopic rod; and finally, the movable main rod is controlled to be matched with the T-shaped connecting block to drive the rear wheel to rise, the whole automatic conversion use can be flexibly driven, the movable rod II is connected to the side face of the seat plate, the movable rod II can move, the whole flexible
usability is expanded, people with different weights and sizes can use the mechanism, and the flexibility is high.