The house bought by the loan can be mortgaged, but it must be approved by the bank. Moreover, when going through the formalities of mortgage twice, only the amount paid before can be mortgaged, such as the money paid when buying a house and the money paid in the first trip after the loan is completed. In addition, if you want to mortgage the house you bought with a loan again, you can only apply for a mortgage at the bank when you buy a house.
Legal objectivity:
Article 9 of the Measures for the Administration of Urban Real Estate Mortgage: If more than two mortgages are set for the same real estate, the mortgagor shall inform the mortgagee of the mortgages already set. The creditor's rights secured by the mortgagor shall not exceed the value of the mortgaged property. After the real estate is mortgaged, if the value of the mortgaged real estate is greater than the balance of the secured creditor's rights, it may be mortgaged again, but it shall not exceed the balance.