Beata Szydlo made the claim during a furious rant against Brussels over its migrant policy.
Mrs Szydlo said the bloc had made a “fatal mistake” by considering massive fines or withholding funds against countries for every single migrant they refuse entry.
She said yesterday: “Poland will continue a prudent and reasonable immigration policy. I am resistant to blackmail and pressure, which are used by, among others, Brussels.”
Beata Szydlo is furious at the EU for its migrant policy
Poland had promised to take in thousands of migrants in 2015 while Donald Tusk, now the president of the European Commission, was leader.
However the following year, the anti-migrant Law and Justice Party were elected with a majority and rejected the deal.
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Mrs Szydlo reiterated this decision last night.
She said: “The European Union made a fatal mistake.
“[They are trying to enforce] solutions that have proven not only that ineffective and have not solved the problem of migration, but still led to the fact that the Union remains now 27 countries.”
Beata Szydlo said Poland should not be made to accept migrants
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She said the policy was “wrong” and could “destroy the unity of the European Union”.
Last month she said it was “impossible” not to link increased migration in Europe with terror attacks across the bloc.
Beata Szydlo accused the EU of attempting to 'blackmail' Poland
Speaking as the EU Commissioner for Migration Dimitris Avramopoulos visited the country, she said the union could not force migration rules.
Mrs Szydlo said: “I hear in Europe very often: do not connect the migration policy with terrorism, but it is impossible not to connect them.
Beata Szydlo meeting Theresa May during a Downing Street visit
“The Commissioner is coming to Warsaw and trying to tell us: you have to do what the EU decided, you have to take these migrants … Two days later another terrorist attack in London occurs.”