Scuffles broke out last night as protestors attempted to break through a police cordon set up on the road to the congress centre in Hanover, where the right-wing party is meeting to elect a new party leadership.
Police also took action after protestors set up illegal road blocks.
Frank Pasemann, an AfD member of the Bundestag, claimed on Twitter a colleague Kay Gottschalk was attacked by 15 “anti-fascist terrorists” as they made their way to the conference centre.
Hanover police spokesman Uwe Lange told a press conference on Friday they were expecting around 8,000 demonstrators.
GettyProtestors on the streets of Hanover ahead of the AfD party congress
1 of 22
Demonstrators scuffle with police during the protest against the anti-immigration party Alternative for Deutschland AfD, after German general election (Bundestagswahl) in Berlin
Mr Lange said the congress centre hosting the AfD event would be ringed with barbed