No, it is illegal for a judge to forge a service receipt, which requires handwriting identification, which violates legal procedures and affects the judicial justice of the case. He can still retry the case or appeal to his superiors. Forgery is invalid. If there is evidence to prove that the court staff forged their signatures, they should bear legal responsibility. Article 84 of the Civil Procedure Law requires a receipt for the service of litigation documents, and the addressee shall record the date of receipt on the receipt and sign or seal it. The date of receipt by the addressee on the service receipt shall be the date of service.