A composite soft support sizeless bra includes a front piece, a soft support rubber strip, a rear piece and a shoulder strap. The soft support strip is arranged on an inner side of the front piece and is connected is connected to a bottom part of the front piece by the shoulder strap to form a W shape, a U-shape, a straight shape, an arc shape or a curved shape. The rear piece and the front piece are integrally formed. The shoulder strap is used to connect the front piece and the rear piece. The inner side of the front piece and/or the rear piece is provided with dot-shaped glues.