Legal analysis: then it has no legal effect. The judicial appraisal opinion must have the signature of the judicial appraiser and the special seal of the judicial appraisal institution, both of which are indispensable, so the judicial appraisal opinion without the signature of the appraiser should be invalid.

Legal basis: Article 25 of the Regulations on Work-related Injury Insurance After receiving the application for labor ability appraisal, the municipal labor ability appraisal committee divided into districts shall randomly select 3 or 5 relevant experts from the medical and health expert database established by it to form an expert group, and the expert group shall put forward appraisal opinions. According to the expert group's appraisal opinions, the municipal labor ability appraisal committee with districts makes a conclusion on the labor ability appraisal of workers with work-related injuries; When necessary, a qualified medical institution may be entrusted to assist in the relevant diagnosis. The municipal labor ability appraisal committee with districts shall make a conclusion of labor ability appraisal within 60 days from the date of receiving the application for labor ability appraisal. When necessary, the time limit for making the conclusion of labor ability appraisal may be extended by 30 days. The conclusion of labor ability appraisal shall be delivered to the units and individuals applying for appraisal in time.