A process for fast humification and non-fermentative bio-stabilization of solid and/or liquid, vegetal and/or animal organic material, comprising the following phases: an initial phase of preparation and pre-treatment of said organic material, for preparing activated and mixed material brought to a substantially neutral pH; a next phase wherein said activated and mixed material at a substantially neutral pH is treated in a reactor, in which it is re-mixed and irradiated with radio frequencies conveyed by waveguides for a given time; a final phase of post-processing the material treated in the reactor, adapted for producing a biostabilized organic product.