The invention discloses a pipeline geological disaster protection device and an installing and using method thereof. The device comprises a supporting base, a lateral buffering wall, pipeline fixing clamps and a buffering layer. The supporting base comprises a sliding rail structure, a first base, a plurality of pressure springs, a plurality of stable pull rods I, a plurality of stable pull rods II and a second base. The lateral buffering wall comprises an L-shaped steel plate and a plurality of pressure springs. Through the arrangement of the compressible supporting base and the sliding railstructure, the lateral buffering wall and the pipeline fixing clamps on the supporting base, when a pipeline is mostly subjected to inclined impact force from landslide and falling stone, sliding in the horizontal and vertical direction can be achieved within the pipeline deformation extreme range, the supporting base and the lateral buffering wall are used for bearing component force in the horizontal direction and the vertical direction and absorbing energy, good pipeline landslide and falling stone impact preventing effects are achieved, meanwhile, cost is low, arrangement is flexible, andconstruction is convenient.