The invention discloses a high-dryness sewage sludge treatment apparatus, comprising an active gas generator (1), a spiral filtering apparatus (2), an oxidation drum (3) and an ultrahigh-voltage electro-osmosis dehydration apparatus (4), wherein the spiral filtering apparatus (2) comprises a spiral shaft (2.1), spiral blades (2.2) and a spiral drum (2.3); the spiral shaft (2.1) is installed in the spiral drum (2.3); the spiral blades (2.2) are arranged on the spiral shaft (2.1) and arrayed between the spiral shaft and the inner wall of the spiral drum; the spiral shaft is hollow; an end inlet of the spiral shaft is communicated with the active gas generator; the wall of the spiral shaft is provided with a vent allowing active gas to enter; the tail end of the spiral drum (2.3) is connected with the oxidation drum (3); the spiral filtering apparatus (2) is of a double-spiral structure; and an outlet of the oxidation drum (3) is communicated with the ultrahigh-voltage electro-osmosis dehydration apparatus (4). The high-dryness sewage sludge treatment apparatus provided by the invention has a wide application scope and low energy consumption, is beneficial for sludge reduction and enables treated sludge to have low water content.