The utility model discloses a bridge modular pattern telescopic device anchoring structure. A connecting steel plate is arranged on a side beam of a modular pattern telescopic device of the anchoring structure. Two pieces of horizontal circular steel penetrate through the connecting steel plate. The two pieces of horizontal circular steel and a supporting beam box body or a displacement rod box body are fixed. An adjustable type anchoring steel plate with a circular hole penetrates through the two pieces of horizontal circular steel and can freely move along the horizontal circular steel. The adjustable type anchoring steel plate is welded with an embedded bar. Meanwhile, U-shaped anchoring bars are welded to the two sides of the supporting beam box body or the displacement rod box body, two horizontal-penetrating steel bars are arranged and penetrate through the embedded bar and the U-shaped anchoring bars at the same time, and connecting anchoring of the horizontal supporting beam box body or the displacement rod box body and the embedded bar is achieved. The problems that in the prior art, a bridge modular pattern telescopic device is poor in anchoring performance, hard to mount and short in service life are solved.