I want to change my job at work. I interviewed a large state-owned enterprise before, and the interview has passed, but I can't leave my job because of my original unit.

I suggest you don't leave your job for the time being. First of all, find out what position and treatment the company you are interviewing can offer you. After that, you can go. Be careful. Don't end up passive, or you can ask for leave from the company you are leaving now, and then you can visit the company you are interviewing with as appropriate. The key is that you are currently in a large state-owned enterprise. If you take half a month off, can you take time off? I wish you success!