The invention discloses a manufacturing technological method for a plastic sofa and soft bed. The method comprises the steps that a plastic skeleton is manufactured, and specifically, high melting point plastic materials are extruded through an extruder to manufacture press profiles, low melting plastic solid materials are injected into the joints of the press profiles through a mechanical plastic injection method to combine extrusion-molded plastic parts, the combined plastic parts are put into an industrial microwave oven, fusion is achieved through the microwave technology and a low melting plastic bonding technology, and a nest-shaped plastic is molded; a perpendicularly-stressed frame is arranged on a base frame part of the plastic sofa and soft bed, and storage boxes of different sizes are mounted in the frame so as to accommodate articles conveniently; invisible plastic fixing clamping pieces are mounted, and specifically, the invisible plastic fixing clamping pieces are used as the connecting pieces of the plastic sofa and soft bed and used for clamping fixing in the plastic frame assembly process; invisible plastic hook-and-loop fasteners are mounted, and specifically, hook-and-loop fastener loop parts are arranged on the surfaces of plastic frame fasteners and used for butt joint of a pad blanket sleeve and a face sleeve, and the plastic frame; and independent-limit slow-spring-return glue sponge is manufactured and mounted.