"The current government, which for the first time in a long period has reduced science funding to below 1.1 percent of GDP, must be replaced," said Czarnek, a former education and science minister.
Speaking at a party policy conference titled "Strong Science — Sovereign Poland" in the north-central city of Bydgoszcz, he also called for a new higher education law, citing what he described as a rapidly changing global environment driven by technological transformation.
"We are on the threshold of an uncertain future," Czarnek said, pointing to a "shift from an analog to a digital era" that he said will require workers to learn new skills and adapt to emerging professions.
He said science must accelerate to better prepare society for changes expected within the next decade.
PiS leader Jarosław Kaczyński said the party had prepared what he described as an ambitious programme for science, emphasising its role in strengthening the state’s "power, prestige and international position."
Kaczyński also stressed the need to attract and retain talent, warning against a "brain drain" as skilled professionals receive lucrative offers abroad, private broadcaster Polsat News reported.
He told the conference that Poland has strong potential in fields such as artificial intelligence.
"Science is both a source of real strength for the state and a key element of its international standing," Kaczyński said.
Poland’s current higher education and science law came into force in October 2018 and has since been amended multiple times, state news agency PAP reported.
Earlier this year, Science and Higher Education Minister Marcin Kulasek said Poland needs to increase spending on research and development to match the European average.
He said R&D spending currently stands at just over 1.5 percent of GDP, compared with an EU average of about 2.2 percent, according to the PAP news agency.
Kulasek, a minister in the centrist government of Prime Minister Donald Tusk, said the government is committed to gradually increasing funding for research, including both project financing and employment in the sector.
Poland's next parliamentary elections are scheduled for the autumn of 2027.