Whether migrant workers are responsible for drinking at the construction site depends on the situation.

1. If the project department of the construction site invites or entertains migrant workers to drink, the construction site shall bear the main responsibility;

2. If the site project department does not invite or entertain migrant workers to drink, migrant workers will entertain themselves to drink, and the site will not bear the main responsibility for the accident.

Consult local judicial offices and law firms for details!

I hope my reply is helpful to you!