 Schröter 1989 was a member of the Social Democratic Party in the GDR, now Social Democratic Party (SPD), and a year later became chairman of the SPD District Association Oranienburg.In May 1990, Schröter was selected as Chief Executive of the Oranienburg circle.From 1990 to 1994 he was also a Member of the Bundestag as a directly elected representative of the constituency Oranienburg - Nauen In 1994, Schröter as Chief Executive of the newly formed County Upper Havel and Chairman of the County Association and Vice-President of Brandenburg county 2001 saw his re-election as district administrator 

In relation to a possible Reorganisation of the Federal Territory,Schroeter in 2000 appealed for the creation of a large north-eastern state.