Legal analysis: of course, it is legal and effective, and you can't go back on your word at will. The divorce mediation will take effect immediately after being signed by both parties, and it has the same legal effect as the divorce certificate and divorce judgment. There are two legal ways of divorce, namely, divorce by agreement or divorce by litigation. In case of voluntary divorce through friendly negotiation, both parties shall sign a divorce agreement on children and property issues, go through the divorce registration formalities after being audited by the civil affairs department and issue a divorce certificate; If the lawsuit is divorced, the court will issue a judgment or divorce mediation.

Legal basis: Article 97 of the Civil Procedure Law of People's Republic of China (PRC). If an agreement is reached through mediation, the people's court shall make a conciliation statement. The conciliation statement shall specify the claim, the facts of the case and the result of conciliation. The conciliation statement shall be signed by the judge and the clerk, stamped with the seal of the people's court and served on both parties. The conciliation statement has legal effect after being signed by both parties.

People's Republic of China (PRC) Civil Code

Article 1076 If a husband and wife divorce voluntarily, they shall sign a written divorce agreement and apply for divorce registration in person at the marriage registration office. The divorce agreement shall specify the expression of willingness of both parties to divorce and the consensus on matters such as child support, property and debt disposal.

Article 1078 If the marriage registration authority finds that both parties are really divorced voluntarily and reach an agreement on matters such as child support, property and debt handling, it shall register and issue a divorce certificate.