The invention relates to the field of chain jamming prevention, and particularly relates to an anti-falling device for assisting a child in going downstairs. The device comprises a wall surface main body and an anti-falling device main body, wherein the wall surface main body is internally provided with a moving track; and stable sliding grooves are formed in the wall surface main body relative tothe upper side and the lower side of the moving track. One sides of inflatable airbags are arranged on the outer sides of clamping blocks, and the inflatable airbags expand outwards and act on the inner walls of clamping grooves in rotating shaft sleeves to drive the clamping blocks to move towards the other ends of the clamping grooves by overcoming acting force of springs, so that the effect ofdriving lower connecting rods to rotate leftwards relative to upper connecting rods is achieved, the upper connecting rods can rotate rightwards relative to a driving part, pedals can rotate rightwards relative to the lower connecting rods, the leg bending shape when an ordinary person goes downstairs is formed, the legs of the child can be repeatedly driven to make leg movement actions when thechild goes downstairs while the anti-falling device main body moves down, and the efficiency of learning the skill of going downstairs by the child is rapidly improved.