A drying device for painting products suitable to carry out the drying of a vehicle; - said vehicle defining ∘ a main development axis; ∘ a first lateral surface; ∘ a second lateral surface opposite to the first lateral surface; ∘ an upper surface; ∘ a lower surface opposite the upper surface; - said drying device comprising a plurality of radiant units defining a radiating surface suitable to perform the drying of said vehicle; said drying device comprising a mobile assembly comprising - a first slider suitable to move at least one of said radiant units along at least part of said first lateral surface; - a second slider suitable to move at least one of said radiant units along at least part of said second lateral surface; - a third slider suitable to move at least one of said radiant units along at least part of said upper surface; and - a fourth slider suitable to move at least one of said radiant units along at least part of said lower surface; - said sliders (31, 32, 33, 34) being moved simultaneously along said main development axis maintaining said radiating surfaces overlapping each other along said main development axis; characterised in that - said mobile assembly comprises a mover device suitable to move said at least one radiant unit with respect to said slider (31, 32, 33, 34) supporting said radiating unit; wherein said mover device comprises a rotation device defining a rotation axis of said radiant unit and wherein said radiating surface defines a longitudinal axis and a transverse axis substantially perpendicular to said longitudinal axis; wherein said mobile assembly comprises two distance meters which are spaced along said transverse axis and a control board for said mover device which is suitable to control rotation of said radiant unit around said rotation axis when said distance meters measure different distances and translation of said radiant unit along said translation axis when said distance meters measure equal distances which are different from a desired distance. - said vehicle defining ∘ a main development axis; ∘ a first lateral surface; ∘ a second lateral surface opposite to the first lateral surface; ∘ an upper surface; ∘ a lower surface opposite the upper surface; ∘ a main development axis; ∘ a first lateral surface; ∘ a second lateral surface opposite to the first lateral surface; ∘ an upper surface; ∘ a lower surface opposite the upper surface; - said drying device comprising a plurality of radiant units defining a radiating surface suitable to perform the drying of said vehicle; - a first slider suitable to move at least one of said radiant units along at least part of said first lateral surface; - a second slider suitable to move at least one of said radiant units along at least part of said second lateral surface; - a third slider suitable to move at least one of said radiant units along at least part of said upper surface; and - a fourth slider suitable to move at least one of said radiant units along at least part of said lower surface; - said sliders (31, 32, 33, 34) being moved simultaneously along said main development axis maintaining said radiating surfaces overlapping each other along said main development axis; - said mobile assembly comprises a mover device suitable to move said at least one radiant unit with respect to said slider (31, 32, 33, 34) supporting said radiating unit; wherein said mover device comprises a rotation device defining a rotation axis of said radiant unit and wherein said radiating surface defines a longitudinal axis and a transverse axis substantially perpendicular to said longitudinal axis; wherein said mobile assembly comprises two distance meters which are spaced along said transverse axis and a control board for said mover device which is suitable to control rotation of said radiant unit around said rotation axis when said distance meters measure different distances and translation of said radiant unit along said translation axis when said distance meters measure equal distances which are different from a desired distance.