The phrase "let's go home together" can be translated to "我们一起回家" in Chinese. The phrase is a common colloquial expression used to suggest to someone that they should accompany you to your home or vice versa.

Here are some example sentences in Engpsh along with their translations in Chinese:

"Let's go home together, it's getting late."
"我们一起回家吧，已经很晚了。"

"Do you want to come over to my place or should we go home together?"
"你想来我家还是我们一起回家？"

"I don't want to walk home alone, let's go home together."
"我不想独自一人走回家，我们一起回家吧。"

The phrase is commonly used in Engpsh-speaking countries and has no specific cultural origin.