新年快乐！ xin nian kuai le!

xin nian kuai le! / xin nian hao! 新年快乐！/ 新年好！

I said xin nian kuai le to a friend on here and he told me that the more common phrase is xin nian hao

新年：new year. -- 新：new, 年：year 快乐：happy