The use of polymeric materials is currently inevitable in all aspects of industry and agriculture. This is an over-massive production of plastic waste that samples global environmental disruption. The discovery of substitute biodegradable polymer components seeks to reduce the same awareness to a minimum while meeting energy and consumption conditions. In this paper, the biodegradability of polylactide (PLA) with the addition of spent coffee grounds by composting was investigated. Biocomposites of different composition of polylactide and spent coffee grounds, ie pure polylactide in adiabatic reactors with a working volume of 1 L during 19 days were investigated. Mass fraction of spent coffee grounds in the prepared composite films was 5, 10, 15 and 20 mass %. During the composting process, the mass loss and temperature change inside the reactor were monitored. The morphological changes of the material were also monitored with a light microscope. The biocomposite with the highest mass fraction of spent coffee grounds showed the best biodegradation results, considering that the largest change in the mass of the sample ana the most irregular shape of the edges of the same sample were observed compared to the pure polylactide sample, which showed no changes after the composting process. Composite materials with a higher proportion of spent coffee grounds are more susceptible to biodegradation since the residue is rich in carbohydrates and presents a food source for microorganisms.