A phase shifter includes: a substrate; a first wiring and second wirings that are provided on one side of the substrate, wherein the second wirings are arranged on two opposite sides of the first wiring; at least one electrically conducting bridge, wherein the electrically conducting bridge and the first wiring intersect and are insulated from each other; and a first isolating part, wherein the first isolating part is provided on one side of the first wiring that is close to the electrically conducting bridge, and an orthographic projection on the substrate of a part of the electrically conducting bridge that intersects the first wiring is located within an orthographic projection of the first isolating part on the substrate; and a surface of one side of the first isolating part that is close to the electrically conducting bridge is not even.