The utility model discloses a long vehicle-mounted folding seat for patients. According to the long vehicle-mounted folding seat for the patients, a seat body and a backrest are connected with each other through rotation shafts at two ends, one ends of seat connection rods are fixed on a rear end surface of the seat body, the other ends of the seat connection rods are connected with corresponding seat connection rod supports through shafts, the seat connection rod supports are fixed on a side wall of a carriage, one ends of backrest connection rods are connected with a rear end surface of the backrest through rotation shafts, the other ends of the backrest connection rods are connected with backrest connection rod supports through shafts, the backrest connection rod supports are fixed on the side wall of the carriage, handrail seat connection rods and handrail backrest connection rods are connected with the seat body and the backrest through rotation shafts respectively, a backrest lock is fixed on the side wall of the carriage, a seat lock is fixed on a seat support, and the seat support is fixed on a stretcher support. The long vehicle-mounted folding seat for the patients is labor-saving, rapid and convenient to fold and unfold; when the seat is unfolded, the seat can bear and transport three sitting patients; and when the seat is folded and attached to the side wall, the seat is small in size, and the transportation of the patients on the stretcher is not influenced.