The invention relates to a method for producing galacturonic acid oligomers, said method being of the type that comprises providing a mixture of galacturonic acid polymers. According to the invention, the method further comprises the following steps: bringing said mixture to a predetermined temperature and pressure for degrading said galacturonic acid polymers in order to obtain a oligomer mixture containing galacturonic acid oligomers having a polymerisation degree dp substantially between 2 and 40； and recovering said galacturonic acid oligomers having a polymerisation degree dp substantially between 2 and 40； in this way, it is possible to obtain oligomers in a predetermined percentage and with a polymerisation degree dp essentially between 2 and 40.
