As the world awaits Mr Trump's decision on climate change after he denounced the Paris pact in his 2016 presidential campaign, Mr Li said China was committed to tackling the issue, both via the Paris Agreement and by setting national targets.
"We are concerned but we (have) chose to implement. and we will join forces with other parties, especially with China, to develop further cooperation on climate and energy", Canete said in an interview during a trip to Denmark.
Li said all foreign companies, including German businesses, were welcome to invest in China, adding that competition must be fair and therefore regulation strong.
European diplomats have been miffed by the Trump administration's disregard for climate change, causing a rift in transatlantic relations. "We are living in times of global uncertainty and see that we have a responsibility to expand our partnership in all the different areas and to push for a world order based on law".
"We are both ready to contribute to stability in the world", Mr Li said.
European and Canadian officials have warned Mr Trump that the United States risks ceding global leadership on combating climate change to China, if it withdraws from the Paris accord.
"President (Vladimir) Putin signed this convention in Paris".
The Chinese Premier is on a two-day official visit to Germany for an annual meeting between the two heads of government, a mechanism that has been in place since 2004.
The joint statement, which will be the first between the China and the European Union, commits to cutting back on fossil fuels, developing more "green" technology and helping raise US$100 billion a year by 2020 to help poorer nations cut emissions, Reuters said.
She said Beijing will uphold the outcome of the Paris Agreement and its implementation.
The deal commits the countries to cut carbon emission.
German Chancellor Angela Merkel, who has in the past even been dubbed the "climate chancellor" for her efforts to fight global warming, welcomed Li's remarks at their joint press conference.
Mr Li said he believed the two had found a solution on the issue of Chinese quotas for electric cars after a lengthy discussion.
While he did not mention the U.S. or Donald Trump, Mr Li's comments were clearly addressed to Washington.
And Miguel Arias Canete, the European commissioner who has led climate talks with Beijing, said of the Paris accord: "No one should be left behind, but the EU and China have chose to move forward".