The incident occurred at Pansadwa village of Kauwakol police station area of the district when both refused to make illegal liquor, Kauwakol police station SHO Manoj Kumar said.
The deceased has been identified as Nirav Manjhi (50) while Chhote Manjhi, who received serious injuries in the incident, is battling for life at a local hospital, Kumar said.
Complete prohibition is in force in Bihar since April 2016 that bans manufacture, trade, sale, storage and consumption of liquor in the state.
None has been arrested so far in the case, the SHO said.