2-3 working days after the internship. The enterprise will issue the internship certificate within 2~3 working days after the internship ends, and it will be delayed if it is busy. If the internship certificate is not received within one week after the end of the internship, you should contact the human resources department of the enterprise in time to urge them to open the certificate. Internship certificate is an important document to prove that interns have really worked in enterprises. Holding a meeting in time after the internship is helpful to the follow-up employment of interns and the management of school education. Therefore, interns can urge enterprises to issue internship certificates in time to better promote their study and career development.