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The ecological problem caused by the disposal of large volumes of plastics materials stimulated the development of new biodegradable materials i.e., poly hydroxybutyrate-co-valerate (PHBV). However, their high price represents the main restriction to wide usage. This situation makes necessary the use of low cost fillers as a way of reducing the cost of the product. Owing to higher production cost of PHBV as compared to traditional polymers, we investigated the possibility to replace a quantity of PHBV by lignocellulosic filler without damaging the properties of the composites. In this study, alfa fiber and its cellulose obtained after extraction were used as reinforcement for the development of totally biocomposite materials. The results show a narrow increasing trend in the tensile strength and tensile modulus.The ecological problem caused by the disposal of large volumes of plastics materials stimulated the development of new biodegradable materials i.e., poly hydroxybutyrate-co-valerate (PHBV). However, their high price represents the main restriction to wide usage. This situation makes necessary the use of low cost fillers as a way of reducing the cost of the product. Owing to higher production cost of PHBV as compared to traditional polymers, we investigated the possibility to replace a quantity of PHBV by lignocellulosic filler without damaging the properties of the composites. In this study, alfa fiber and its cellulose obtained after extraction were used as reinforcement for the development of totally biocomposite materials. The results show a narrow increasing trend in the tensile strength and tensile modulus.