The difference between primary school compulsory education certificate and primary school diploma lies in the different educational system and different functions.

1, different academic system: the academic system of the primary school compulsory education certificate is nine years, which is the compulsory education stage stipulated by the state, while the academic system of the primary school diploma is six years, which is the primary school stage.

2. Different functions: The certificate of compulsory education in primary schools is mainly used to prove that students have completed the nine-year compulsory education prescribed by the state and are qualified to take the junior high school entrance examination. Primary school graduation certificate is the proof of students' academic achievements in primary school, which can be used as an important basis for students' further studies and employment.