The invention discloses a displacement box and a modular pattern telescopic device, and relates to the field of bridge members. The displacement box comprises a box body, an upper support, a lower support and a cross beam, wherein the upper support is connected to the lower portion of a box top plate, the lower support is connected to the upper portion of the box bottom plate, the cross beam is slidably connected with the upper support and the lower support, and an included angle is formed between the lower surface of the box bottom plate and the horizontal plane; the modular pattern telescopic device comprises the cross beam, a middle beam, two displacement boxes and two side beams, wherein the two side beams are located on the two sides of the middle beam and are fixedly connected with the upper surface of one or more displacement boxes, the middle beam is installed on the upper surface of the cross beam, the two displacement boxes are provided with openings in the two opposite surfaces, the cross beam transversely penetrate through the openings and are integrally connected; and the included angle between the box body bottom plate and the horizontal plane of the displacement boxand the modular pattern telescopic device increases the fluidity of a grouting material, and the phenomenon that bottom plates disengaging of the displacement boxes is avoided.