The strike is part of a student movement that is asking for the withdrawal of all criminal charges and penalties linked to last spring's tuition conflict.
On Monday evening, close to 1,000 people voted at a general assembly in favour of staging a strike.
CBC reporter Morgan Dunlop visited the campus this morning. She said it was quiet, except for the occasional student who attempted to open the lock doors.
The Cegep is closed until Thursday. Normal activities will resume on Friday.