Legal analysis: Of course, the loan guarantor needs to sign, and only by signing is he agreeing to assume corresponding responsibilities. If you don't sign, you won't be able to enter into a guarantee contract with the lender, and you won't be able to prove the guarantor's facts, which will not be recognized by law, and the guarantor will have no guarantee liability. Also, if the guarantor is a company, it needs to be signed by the legal representative or stamped with the official seal of the company.

Legal basis: Article 688 of the "People's Republic of China and Civil Code" If the parties agree in the guarantee contract that the guarantor and the debtor shall bear joint and several liability for the debt, it is a joint liability guarantee. When the debtor under a joint liability guarantee fails to perform the due debt or a situation stipulated by the parties occurs, the creditor may request the debtor to perform the debt or request the guarantor to assume the guarantee liability within the scope of its guarantee.