The video shows Charles speaking to the man for a few brief seconds before the staff member's body begins to sway from side to side as he starts to lose his balance.
He then falls backwards on to concrete.
People rush to help the man as Charles watches over.
Once the Prince of Wales is told the man is alright, he moved on to greet another Asda worker.
The staff member is escorted away before returning to his conversation with the prince just a few minutes later.
People were keeping their 2m social distancing during the royal visit to the distribution centre.
Charles and Camilla met some of the 700 staff members who work at the Asda centre in Bristol.
Staff told the royals how some had returned from retirement and others worked extra hours and postponed holidays to cope with the increased demand from supermarkets.
