The invention relates to the field of furniture processing and discloses an arc hot press. The arc hot press comprises a press base, an upper die and a lower die. A first movable groove is formed in the lower die, a second air cylinder is mounted in the first movable groove, and the output end of the second air cylinder is connected with a convex plate; first channels used for delivering steam andsecond channels used for pumping air out are formed in the two sides of the lower die correspondingly; a second movable groove is formed in the upper die, and a concave plate is slidably connected into the second movable groove; second communicating openings are formed in the two sides of the concave plate correspondingly, and an inwards-sunken part matched with a protruding part and horizontal parts used for closely abutting against the two sides of a wood plate are arranged at the bottom of the concave plate; and third channels used for delivering the steam are formed in the two sides of the upper die. According to the arc hot press, steam softening, pressing, shape fixing and drying of the wood plate are integrated, so that the pressing efficiency of the arc wood plate is improved greatly, the wood plate can be subjected to uniform steam softening and dried, wood plate fracturing or deforming caused by nonuniform softening or nonuniform drying of the wood plate is avoided, and thepressing effect of the arc wood plate is enhanced greatly.