The present invention relates to biodegradable protein based thermoset compositions formulated from a powder of a dry and finely ground protein material, from which the water has been thoroughly removed, an anhydrous and liquid alcohol and other optional additives. The inventions also relates to the method for obtaining these compositions in which the components are homogeneously mixed, under controlled conditions of temperature and moisture, to obtain a homogenous and shelf-cohesive mass, that can be shaped in any predetermined form by diverse molding methods, being readily set through the application of a certain amount of heat during a short period of time, which enables it to turn into a solid shaped body or article through a very simple process.