In a Facebook post, the Tokyo-born Okamura also invited voters to a concert in Prague on April 25, to be attended by far-right leaders Marine Le Pen of France and Geert Wilders of the Netherlands.
"My friend, the Italian interior minister and colleague from our European patriotic fraction Matteo Salvini visited me in Prague," said Okamura, without specifying when it took place.
"We discussed the current situation concerning migration and the Islamisation of Europe, Matteo being the only one who tackles both with success... and also news about the dreadful directive policy of the EU," he added.
Okamura, chairman of the far-right SPD party that has 19 lawmakers in the 200-seat Czech parliament, said he and Salvini had also pondered a remedy to the EU's "fatal" farming policy which has "destroyed" Czech agriculture.
Salvini, who heads the anti-immigrant League party, on Monday met several European far-right leaders in Milan in a bid to forge an unlikely alliance of nationalists ahead of the May 23-26 EU vote.
He said he hoped the new bloc would be the largest in the 751-member European Parliament.
Le Pen and Wilders already met with Okamura in Prague after he made it to the parliament in the 2017 general elections.