The invention discloses a press foot for sewing a cushion with a built-in filler. The press foot comprises a main press foot and a movable press foot, wherein the main press foot comprises two side press feet and a middle press foot; the middle press foot is arranged between the two side press feet; the side press feet are connected with the middle press foot through connection parts; a side press foot connection rod mounting part is arranged on each side press foot; the movable press foot is arranged on the main press foot and comprises a movable press foot bracket, two press foot base plates, two positioning rings and a main press foot connection rod mounting part; the main press foot connection rod mounting part is arranged at the tail of the movable press foot bracket; the two press foot base plates are arranged at the bottom of the movable press foot bracket and positioned at two sides of the middle press foot; a needle hole is formed in each press foot base plate; and the positioning rings are arranged on the two side brackets of the movable press foot bracket and opposite to the needle holes. The press foot device of the sewing machine can be pressed on cloth with the built-in filler, so that the filler is divided into three parts along the press foot, thus the effect of sewing 2 to 3 pieces of cloth with the built-in fillers can be achieved.