"Chinese people on both sides of the Taiwan Strait are one family. No one can sever our blood ties, and no one can stop the historical trend of the reunification of the motherland," Xi said in a speech broadcast on state media.
Xi's comments come just weeks before Donald Trump takes office in the US.
Taiwan is a key point of contention between Beijing and Washington, which does not officially recognise Taiwan diplomatically but is its strategic ally and largest supplier of weapons.
The US-China relationship may sour further after Trump is inaugurated on January 20.
China has issued a horrifying four-word warning to the world as Xi Jinping continues to look to assert his country's dominance over Taiwan, which it sees as its territory.President Xi has issued a stern warning in his New Year's speech, stating that no one can prevent China's "reunification" with Taiwan.
This comes as Beijing continues to increase military pressure around Taiwan, with warships and planes frequently entering the island's waters and airspace.
Despite this, Taiwan's government maintains its democratic governance and rejects Beijing's claims, insisting that only the Taiwanese people can determine their future.
Xi emphasised the familial ties between the two sides of the Taiwan Strait.
