In today's world, the role of packaging material is increasingly pronounced, and at the same time it represents a kind of a problem, considering how improper storage of packaging material in the environment can lead to environmental disasters that consequently affect human life. The biggest problem is packaging material produced based on fossil fuels. This is exactly the reason for the development of biodegradable polymer materials that would be produced from renewable sources and after their use they could easily be degraded under the influence of bacteria and microorganisms. An excellent alternative to petroleum-derived polymers is the polylactic acid (PLA) biopolymer, mostly used in the packaging industry. However, PLA exhibits high brittleness and low elongationat break that limit the wide application. Blending with flexible plasticizers such as poly- (ethylene oxide) (PEO), polyethylene glycol (PEG), triethyl citrate (TEC), tributyl citrate (TBC), acetyl-tributyl citrate (TBAC), is one of the best ways to toughen PLA.). The aim of this work is the development of a "green" polymer material, respectively a biocomposite material from PLA/olive waste that could be used as a packaging material. The investigations were conducted on two groups of biocomposites without and with plasticizer. Thermal properties were investigated using differential scanning calorimetry (DSC), information on the chemical composition and structure of the biocomposite was obtained by FTIR-ATR spectroscopy, mechanical properties were performed using tensile tests. The obtained FTIR, DSC results as well as mechanical properties show that triethyl citrate (TEC) can be a good plasticizer for PLA/OLIV biocomposites, it increased the flexibility and reduced the brittleness of biocomposites, which is good for the application of these biocomposites as packaging materials.