Apparatus for the dehumidification of loose materials, particularly pellets for plastic moulding plants including: a) at least a second container for the processing of the pellets, in which microwave generators (5 and 6) operate; b) a circuit for the distribution of a dehumidified airflow inside said second container; c) means for the aspiration of the airflow enriched with humidity from the inside of said second container, for allowing said airflow to be subsequently dehumidified and reintroduced inside said second container; wherein: d) it comprises a first vertical container to contain the pellets to be processed; said first vertical container is a conical shaped container, heated, provided with a charging intake, and a discharge nozzle of the loose material, which leads inside said second container orthogonal with respect to said first container which is placed horizontally, said first vertical container being provided with sensors (102, 103) which indicate the level of loose material present inside the container and the relative humidity percentage and/or the present temperature inside said first container; e) the second container, is in communication with said first container for the processing of the pellets, and comprises a main chamber with a fluidized bed and also with a mixer/advancement means of the pellets, in the main chamber in which, said microwave generators (5 and 6) operate on the upper side of the container, said microwave generator devices (5 and 6) are aligned and placed spaced apart in such a way to direct their action towards the underlying main chamber of the second container; Wherein said second container, on the bottom of the main chamber comprises an auger and for the whole length of the same, is provided with a fluidized bed provided by a sintered sheet, underneath which an airspace for the distribution of a dehumidified airflow at a controlled temperature is provided, coming from an underlying heating chamber with which it is in communication through at least one intake and in which inside the heating chamber electric resistance means are provided for the heating of the introduced dehumidified air inside the same through an intake and upstream of which a pump group is operative, in a manner that the pellets, thanks to the presence of the fluidized bed along the second container, subjected to the air jet at a controlled temperature, remains in a floating condition, which facilitates a uniform processing of the single particles, said second container comprising, at the side of a head, in the part underlying it, a discharge nozzle of the loose material, said discharge nozzle comprising downstream at least one humidity and/or temperature and/or weight sensor, that precedes a valve supplying a predetermined quantity in a manner that allows continuous processing cycles of the pellets. a) at least a second container for the processing of the pellets, in which microwave generators (5 and 6) operate; b) a circuit for the distribution of a dehumidified airflow inside said second container; c) means for the aspiration of the airflow enriched with humidity from the inside of said second container, for allowing said airflow to be subsequently dehumidified and reintroduced inside said second container; wherein: d) it comprises a first vertical container to contain the pellets to be processed; said first vertical container is a conical shaped container, heated, provided with a charging intake, and a discharge nozzle of the loose material, which leads inside said second container orthogonal with respect to said first container which is placed horizontally, said first vertical container being provided with sensors (102, 103) which indicate the level of loose material present inside the container and the relative humidity percentage and/or the present temperature inside said first container; e) the second container, is in communication with said first container for the processing of the pellets, and comprises a main chamber with a fluidized bed and also with a mixer/advancement means of the pellets, in the main chamber in which, said microwave generators (5 and 6) operate on the upper side of the container, said microwave generator devices (5 and 6) are aligned and placed spaced apart in such a way to direct their action towards the underlying main chamber of the second container; Wherein said second container, on the bottom of the main chamber comprises an auger and for the whole length of the same, is provided with a fluidized bed provided by a sintered sheet, underneath which an airspace for the distribution of a dehumidified airflow at a controlled temperature is provided, coming from an underlying heating chamber with which it is in communication through at least one intake and in which inside the heating chamber electric resistance means are provided for the heating of the introduced dehumidified air inside the same through an intake and upstream of which a pump group is operative, in a manner that the pellets, thanks to the presence of the fluidized bed along the second container, subjected to the air jet at a controlled temperature, remains in a floating condition, which facilitates a uniform processing of the single particles, said second container comprising, at the side of a head, in the part underlying it, a discharge nozzle of the loose material, said discharge nozzle comprising downstream at least one humidity and/or temperature and/or weight sensor, that precedes a valve supplying a predetermined quantity in a manner that allows continuous processing cycles of the pellets.