German Chancellor Angela Merkel has been punished for her open door refugee policy as new figures show support for her conservative CDU party continuing to crumble.

With 434,019 members at the end of last month the CDU has now slipped behind the social democrats with 13,000 people tearing up their party cards this year.

Many of them switched to the hard-right anti-immigration Alternative for Germany (AfD).

German Chancellor Angela Merkel (pictured) has been punished for her open door refugee policy as new figures show support for her conservative CDU party continuing to crumble

The news was a little better for the centre left SPD which rules Germany as the junior partner in a coalition led by the CDU.

It has shed 9,000 members this year as a result of underwriting the migrant influx which brought with it terror and death to the country.

But when Donald Trump won the American election, and as support for extremism in the form of the AfD and neo-Nazis continues to rise, the party has been making up ground with 2,000 new members attracted in November alone.

It now boasts more members than Mrs. Merkel's party nine months before Germany goes to the polls in a general election in which she will seek a fourth term in office.

The AfD has capitalised enormously on the problems that the refugee influx has created in the country with nearly 5,000 new members in the past few months.

'Their enormous popularity lies witgh the policy failures of the old parties and the large vacuum that created,' said AfD's executive board member Georg Pazderski.

Support for the far-right German party AfD has surged this year. Members are pictured during a rally earlier this month with a sign saying 'Merkel has to leave'

A new poll taken by the Forsa research group for Stern magazine showed 28 percent of respondents believing Chancellor Merkel's refugee policy was 'jointly responsib le' for the Berlin Christmas market attack on December 19 which killed 12 and injured 48.

And three quarters of all citizens - 76 per cent - assume that the terror threat and the security situation in Germany will play an 'important role' in the general election.

A total of 67 percent of respondents said they believed a debate on the subject of internal security during the election campaign would harm rather than help the chancellor.

The AfD, which trounced the chancellor in several key regional elections in 2016, is looking to gain seats in the national parliament for the first time next year.