Blocking device for root gap of aluminum formwork

The utility model provides an aluminum formwork root gap plugging device which comprises a connecting frame, an inverted-L-shaped plate is arranged at the lower end of the connecting frame, a square pipe capable of vertically sliding is arranged on the lower side of the inverted-L-shaped plate, the connecting frame and the square pipe are connected through a plurality of connecting assemblies, and each connecting assembly comprises a vertical flat-end pin shaft. The lower end of the flat-head pin shaft sequentially penetrates through the connecting frame, the inverted-L-shaped plate and the upper end of the square pipe and is arranged in the square pipe, a positioning cotter pin is inserted into the lower end of the flat-head pin shaft, a supporting spring is sleeved on the flat-head pin shaft between the inverted-L-shaped plate and the square pipe, one side of the square pipe abuts against the inner wall of the inverted-L-shaped plate, and the other side of the square pipe is provided with open holes in one-