The invention discloses a physical model testing device for influence on adjacent pipelines under the damaged condition of a buried pipeline. A device main body comprises rectangular openings, tempered glass panel notches and semicircular openings, wherein the rectangular openings are positioned in the left side and the right side of the device main body; at least two rectangular openings are vertically formed in each side of the device main body; the tempered glass panel notches are positioned in the front part of the device main body; the semicircular openings are formed in the bottom of thedevice main body; each pipeline sliding platform comprises a sliding chute, a pipeline support and a sleeve; the sliding chutes are positioned in the upper ends and the lower ends of the corresponding rectangular openings; each pipeline support can be positioned in the corresponding sliding chute in a sliding manner; each sleeve is embedded into a ring arranged on the corresponding pipeline support; two ends of each buried pipeline are positioned in the left sleeve and the right sleeve. The physical model testing device disclosed by the invention has better accuracy; the device can be used for simulating relative positions, different diameters and shapes of breaking ports of two adjacent buried pipelines and measuring and analyzing strain, deformation characteristics and damage process ofthe pipeline, and provides an experimental basis for damage causes of the buried pipelines.