"他很兴奋" 的英文表达方式有很多种，常用的有：

He's very excited.
He's thrilled.
He's over the moon.
He's ecstatic.

来源：

"excited" 是英语中最常用的词语，意思是兴奋、激动。
"thrilled" 是指感到兴奋、激动、兴高采烈的。
"over the moon" 是指非常兴奋、高兴。
"ecstatic" 是指非常兴奋、高兴、狂喜。

例句：

He's very excited about his new job. (他对他的新工作非常兴奋。)
She was thrilled to see him again. (她非常高兴再次见到他。)
They were over the moon about their wedding. (他们对他们的婚礼非常兴奋。)
She was ecstatic when she won the first prize. (她获得第一名时非常兴奋。)