How long can I get the lawyer's professional qualification certificate after the internship in Shenzhen expires?

One year. You need to practice in a law firm for one year, pass the bar association examination, have good conduct, and take the national unified judicial examination to obtain the lawyer qualification certificate. Shenzhen, referred to as Pengcheng for short, is a sub-provincial city, a city under separate state planning, a megacity in Guangdong Province, a China Special Economic Zone approved by the State Council, a national economic center city and an international city.