Almost 70 workers at Brisbane's XXXX brewery have walked off of the job as they demand more employment security amid fears contract workers will be brought in and paid less.

Supporters gathered outside the Milton Brewery for one hour on Monday morning as workers walked out holding a 'KEEP XXXX ON HOME TURF' banner.

About 70 staff have walked off the job at the XXXX Brewery at Milton.

United Voice Queensland spokesman Damien Davie said XXXX would create a cheaper workforce by employing contract staff at a lower pay rate through a third party.

However, a XXXX spokesman said contract workers were paid the same rate as permanent staff.