A biodegradable polymer blend, characterized in that it contains at least one component, at least one component, and at least one component, wherein - component includes polymers based on lactic acid, preferably homopolymers of PLLA, PDLA, as well as their copolymers, or mixtures of their homopolymers, mixtures of their homopolymers and copolymers, or mixtures of their copolymers; - component includes thermoplastic starch, the thermoplastic starch representing a mixture of starch and at least one plasticizer from the group of substances and at least one modifier from the group of substances; - group of substances includes plasticizers for starch, namely one-, two- and multiple hydroxyl groups containing alcohols and polyols, especially glycerine, ethylene glycol, propylene glycol, diols, triols and polyols, polyethylene glycol, polypropylene glycol, neopentyl glycol, sorbitol, mannitol; - group of substances includes modifiers, namely saturated or unsaturated carboxylic acids, dicarboxylic acids, tricarboxylic acids or polycarboxylic acids, saturated or unsaturated anhydrides, and mixed anhydrides of carboxylic acids, substances containing isocyanate groups, preferably diisocyanates, substances containing expoxide groups, acyl halides, acyl imidazoles, acylphosphates, thioesters of acids, or a combination thereof; - component includes homopolymers or copolymers of polyhydroxyalkanoates (PHAs), and/or their mixtures, wherein they are preferably homopolymers or compolymers based on PHB and/or their mixtures; and the biodegradable blend can optionally contain component, wherein - component includes plasticizers for PLA and/or for PHA, preferably esters and low-viscosity polyesters, in particular esters or low viscosity polyesters of citric acid, esters or low viscosity polyesters of glycerine, esters or low viscosity polyesters of diols and polyols, esters or low viscosity polyesters of phosphoric acid, esters or low viscosity polyesters of sebacic acid, esters or low viscosity polyesters of adipic acid, esters or low viscosity polyesters of phthalic acid, and other liquid esters and/or low viscosity polyesters and copolyesters, or their mixtures, wherein the viscosity of the plasticizer for PLA a/and PHA, measured using a coaxial-cylinder rotational viscometer at 25 °C according to the description, is lower or equal to 20,000 mPas. - component includes polymers based on lactic acid, preferably homopolymers of PLLA, PDLA, as well as their copolymers, or mixtures of their homopolymers, mixtures of their homopolymers and copolymers, or mixtures of their copolymers; - component includes thermoplastic starch, the thermoplastic starch representing a mixture of starch and at least one plasticizer from the group of substances and at least one modifier from the group of substances; - group of substances includes plasticizers for starch, namely one-, two- and multiple hydroxyl groups containing alcohols and polyols, especially glycerine, ethylene glycol, propylene glycol, diols, triols and polyols, polyethylene glycol, polypropylene glycol, neopentyl glycol, sorbitol, mannitol; - group of substances includes modifiers, namely saturated or unsaturated carboxylic acids, dicarboxylic acids, tricarboxylic acids or polycarboxylic acids, saturated or unsaturated anhydrides, and mixed anhydrides of carboxylic acids, substances containing isocyanate groups, preferably diisocyanates, substances containing expoxide groups, acyl halides, acyl imidazoles, acylphosphates, thioesters of acids, or a combination thereof; - group of substances includes plasticizers for starch, namely one-, two- and multiple hydroxyl groups containing alcohols and polyols, especially glycerine, ethylene glycol, propylene glycol, diols, triols and polyols, polyethylene glycol, polypropylene glycol, neopentyl glycol, sorbitol, mannitol; - group of substances includes modifiers, namely saturated or unsaturated carboxylic acids, dicarboxylic acids, tricarboxylic acids or polycarboxylic acids, saturated or unsaturated anhydrides, and mixed anhydrides of carboxylic acids, substances containing isocyanate groups, preferably diisocyanates, substances containing expoxide groups, acyl halides, acyl imidazoles, acylphosphates, thioesters of acids, or a combination thereof; - component includes homopolymers or copolymers of polyhydroxyalkanoates (PHAs), and/or their mixtures, wherein they are preferably homopolymers or compolymers based on PHB and/or their mixtures; and the biodegradable blend can optionally contain component, wherein - component includes plasticizers for PLA and/or for PHA, preferably esters and low-viscosity polyesters, in particular esters or low viscosity polyesters of citric acid, esters or low viscosity polyesters of glycerine, esters or low viscosity polyesters of diols and polyols, esters or low viscosity polyesters of phosphoric acid, esters or low viscosity polyesters of sebacic acid, esters or low viscosity polyesters of adipic acid, esters or low viscosity polyesters of phthalic acid, and other liquid esters and/or low viscosity polyesters and copolyesters, or their mixtures, wherein the viscosity of the plasticizer for PLA a/and PHA, measured using a coaxial-cylinder rotational viscometer at 25 °C according to the description, is lower or equal to 20,000 mPas.