Can I sue my ex-husband for not paying back the money?

Legal analysis: the ex-husband can sue the court for repayment if he owes money.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 188 The limitation of action for requesting the people's court to protect civil rights shall be three years. Where there are other provisions in the law, those provisions shall prevail.

The limitation period of action shall be counted from the date when the creditor knows or should know that the right is damaged and the debtor knows it. Where there are other provisions in the law, those provisions shall prevail. However, the people's court shall not protect the rights that have been damaged for more than 20 years. Under special circumstances, the people's court may decide to extend the time according to the application of the obligee.

Article 676 If the borrower fails to repay the loan within the agreed time limit, it shall pay the overdue interest in accordance with the agreement or the relevant provisions of the state.