Adjustable automobile waist rest device

The utility model relates to the technical field of automobile accessories. The utility model relates to a backrest, in particular to an adjustable automobile backrest device. The device structurallycomprises a body, a first elastic band, a first positioning piece, a second elastic band, a second positioning piece and a third elastic band, the utility model has the following beneficial effects; in order to solve the problems that in the prior art, when a novel adjustable automobile waist rest device is used, the side protection height cannot be adjusted; the problem that the waist rest side protection part is single is solved. A first side protector and a second side protector are designed; during use, the first positioning piece and the second fastening piece can be connected in an inserted manner; the second positioning piece and the first fastening piece are connected in an inserted mode to fix the body and the seat in an attached mode. When the adjustable back cushion is used, theheight of the adjustable