A device (1) apt to perform a magnet therapy treatment of persons and animals, allowing to treat subjects in a manner compliant with a specific therapeutic protocol and without a break in the applying of the treatment itself. The device mainly comprises a main body (2) in the form of a mat or carpet incorporating a pair of magnetic field delivery plates (20A, 20B), a programmable control unit (3) and a system for detection of the presence of a subject lying on the main body (Fig. 1).