An agro-industrial process with minimal environmental impact, of the type comprising a step of cultivating vegetable and/or mushroom products, a step of harvesting said products, at least one step of thermo-mechanical treatment of said products in order to obtain intermediate products, and a step of packaging of a final stage of said intermediate products, characterized in that - said thermo-mechanical treatment step provides for a mechanical process of removing the unnecessary parts from said products so as to define waste; - said waste, constituted exclusively by vegetable substances, is separated from the intermediate products, intended for the subsequent treatment and packaging steps, and sent into a biogas production unit; - the digestate, constituted by the waste of said biogas production unit that provides an anaerobic digestion that consists of the breakdown, by microorganisms, of complex organic substances, such as lipids, proteins, glucids and of the recombination of the carbon and hydrogen contained therein to form methane and carbon dioxide, is used as a fertilizer on the respective cultivation soil in a new step of cultivation of vegetable products, wherein said biogas production unit comprises a fermentation tank that accommodates process waste of agricultural origin, comprising said waste of said products, and purification sludge generated by the purification plant inside the facility in which the wastewater used in the transformation process is treated, wherein said facility is the facility in which processing of the vegetables and/or mushrooms takes place, said purification sludge comprising a predominant liquid fraction and a solid fraction, and wherein said fermentation tank accommodates said purification sludge in a percentage comprised between 60% and 70%, said waste of said products in a percentage comprised between 5% to 10%, and corn and triticale in a percentage comprised between 20% and 30%, and optionally a liquid fraction of a corresponding digestate. - said thermo-mechanical treatment step provides for a mechanical process of removing the unnecessary parts from said products so as to define waste; - said waste, constituted exclusively by vegetable substances, is separated from the intermediate products, intended for the subsequent treatment and packaging steps, and sent into a biogas production unit; - the digestate, constituted by the waste of said biogas production unit that provides an anaerobic digestion that consists of the breakdown, by microorganisms, of complex organic substances, such as lipids, proteins, glucids and of the recombination of the carbon and hydrogen contained therein to form methane and carbon dioxide, is used as a fertilizer on the respective cultivation soil in a new step of cultivation of vegetable products, wherein said biogas production unit comprises a fermentation tank that accommodates process waste of agricultural origin, comprising said waste of said products, and purification sludge generated by the purification plant inside the facility in which the wastewater used in the transformation process is treated, wherein said facility is the facility in which processing of the vegetables and/or mushrooms takes place, said purification sludge comprising a predominant liquid fraction and a solid fraction, and wherein said fermentation tank accommodates said purification sludge in a percentage comprised between 60% and 70%, said waste of said products in a percentage comprised between 5% to 10%, and corn and triticale in a percentage comprised between 20% and 30%, and optionally a liquid fraction of a corresponding digestate.