The invention relates to a metro depot flexible contact network trackless construction method. The method is characterized by comprising the following steps of 1, calculation of point position coordinates of pillar piles, tie-line foundation piles and corresponding line central piles; 2, measurement and positioning of point position coordinates of the pillar piles, the tie-line foundation piles and the corresponding line central piles; 3, foundation grouting, pillar erection, portal beam location survey and wrist arm calculation and material ordering; 4, portal beam erection, wrist arm pre-matching, installation and re-check. The method is scientific and reasonable, and has the advantages of being capable of shortening the construction time, improving the construction precision, safe, reliable, capable of lowering the construction cost, easy to achieve and the like; the metro depot flexible contact network construction method is high in innovativeness.