“That’s democracy carried out in the style of [Russian leader Vladimir] Putin and a dangerous 'Putinization' of European politics,” Schulz added, as quoted by the website.
The comments come in relation to the constitutional crisis in the country, its worst since 1989, the year of the first elections in its post-war history.
The Polish Constitutional crisis of 2015 is a series of conflicts following the Polish parliamentary election of October 2015 regarding amendments to the organization of the Polish Constitutional Court. The amendments caused domestic and international criticism.
Both politicians ruled out that their comments represented any interference into the internal affairs of a country.
Earlier in December Poland had demanded an apology from Schulz after he called its judicial changes a ‘coup’.
"What is happening in Poland has the characteristics of a coup and is dramatic. I am going on the principle that we are going to discuss this in detail this week at the European parliament, or at the latest, during the session in January," he then told Deutschlandfunk radio.
Schulz's comments sparked an angry response from Warsaw, with Polish Prime Minister Beata Szydło demanding an apology.
"I am expecting Mr Martin Schulz to not only stop making such comments but also apologize to Poland," she added.
The political tensions center around efforts by the ruling party to install five judges of its own choosing on the 15-member court, and refusing to recognize judges who were appointed by the previous parliament when the liberal Civic Platform (PO) party was in power.
It also comes on the heels of legal moves giving Poland's conservative government the power to directly appoint the heads of public broadcasters.