The invention discloses a pipeline calibration method, which comprises the following steps of: S1, determining the opening circle center of a first pipeline; S2, determining the vertical distance between the opening circle center of the first pipeline and a working surface; S3, subtracting the height of a bend pipe from the vertical distance to obtain a second height; S4, determining a second position horizontal with a first position on one side of a second pipeline by using a U-shaped pipe horizontal principle; and S5, determining a third position above the second position, wherein the distance between the second position and the third position is equal to the height of the bend pipe, and the third position is the circle center of a horizontal opening of the bend pipe after calibration. In the pipeline calibration method, an oblique working surface is given away from serving as a base plane, and an imaginary line passing through the circle center of the pipeline opening is used as a base line, so errors caused by irregularity of the working surface can be avoided, and the position of the pipeline can be calibrated accurately so as to realize good connection between the pipelines.