Weight lifting bed with adjustable intensity for chest-expanding exercise

The utility model discloses a weight lifting bed with adjustable intensity for chest-expanding exercise. The weight lifting bed comprises an under bed and balance weights, wherein the back part of the under bed is an H-shaped or a U-shaped barbell stand; the middle part of the under bed is provided with a lying bed; and the front part of the under bed is hinged with an arm lifting rod. The upper end of the barbell stand is provided with barbell brackets; a barbell rod is arranged on the barbell brackets; and two ends of the barbell rod are adaptable to the balance weights. A chest-expanding rod is symmetrically hinged on two sides of the lying plate on the under bed; the upper part of each chest-expanding rod is provided with a chest-expanding bracket rod; the lower part of each chest-expanding rod is provided with a first hook rod; and each first hook rod is adaptable to each balance weight. The upper part of the arm lifting rod is provided with an upper rod; the lower part of the arm lifting rod is provide