To provide a pressure water supply system and supply device for a unit chair for dental use.

This pressure water supply system for a unit chair for dental use includes a pressurizing means 10 to discharge water flowing from a water supply source at a specified pressure, a water purifying means 20 to purify pressure water discharged from the pressurizing means 10 to which a medical equipment 12 is connected, a storage tank 30 to store pressure water passing the water purifying means 20 in a specified pressure condition, and a heating means 40 to supply pressure water passing the water purifying means 30 to the unit chair for dental use at a specified temperature for purifying pressure water to be used in the unit chair for dental use and supplying it while maintaining a constant pressure.