Contact survey method for existing metro transfer station

The invention relates to a contact survey method for an existing subway transfer station. The existing subway transfer station contact survey method comprises the following steps: arranging and observing a first ground near well point and a second ground near well point on a ground layer; hanging a first steel wire, a second steel wire, a third steel wire and a fourth steel wire; setting a first upper-layer near-well point, a second upper-layer near-well point and a third upper-layer near-well point; performing contact survey on the first upper-layer near well point and the second upper-layer near well point, and guiding data to the third upper-layer near well point; hanging a fifth steel wire and a sixth steel wire; setting a first lower-layer near-well point and a second lower-layer near-well point; and carrying out contact survey on the first lower-layer near well point, and guiding and surveying data to the second lower-layer near well point. The existing metro transfer station contact survey method has t