Excuse me: if the name signed on the accident insurance policy is crossed out and rewritten, is the document still valid? thank you

You mean the last signature of the insurance policy, right? Why don't you fill it out again, cross it out and rewrite it? Second, it is easy to cause disputes. An insurance policy is not an insurance contract. If you make a mistake, you can fill it in again. An insurance agent should carry several insurance policies with him. One of the purposes is to prevent customers or themselves from making mistakes.