Embodiments of the present invention provide a phase shifter, an electrically regulated antenna, a network device, and a phase shifter manufacturing method. The phase shifter comprises: a shielding member, and an adjustable dielectric layer provided in a shielding space formed by the shielding member; the adjustable dielectric layer comprises a line layer and a dielectric member. The line layer comprises a feed circuit and an empty slot arranged corresponding to the feed circuit and used to form an air strip line. The dielectric member is inserted into the empty slot, and the dielectric constant of the feed circuit is changed by controlling the depth of the dielectric member inserted into the empty slot.
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