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Elon Musk says he's the country's kingmaker ... 'cause he says Donald Trump wouldn't have won the election without him -- and the whole Republican Party would be in shambles, too!

The tech mogul fired off a series of tweets directed at POTUS ... including one where he said, without him, Trump would be sitting at home watching President Kamala Harris at the country's reins.

He adds, "Dems would control the House and the Republicans would be 51-49 in the Senate" ... so, Elon's pretty sure he's the only reason for the Republicans' recent decisive victory. He followed it up by accusing Republicans of being ungrateful to him.

Of course, this animosity between Elon and the prez is coming out because Musk is pissed about the recent tax and spending bill passed by the House of

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