To provide a vegetable liquid-feeding device securely supplying an amount of liquid evaporating in a container in which vegetables are held and sustaining the water level of the container in which vegetables are held.

This vegetable liquid-feeding device has such a mechanism that a PET (polyethylene terephthalate)-bottle 3 is invertedly held in a water supply container 2 supported with fixed supports 6 and set on the offering stand 14 of a tombstone, and water discharged from the opening part 3a of the PET-bottle 3 flows through a tube 5 to a flower cylinder 4 held in a flower stand 13 of the tombstone. The discharge of water from the opening part 3a stops when the standard water level 17 of the flower cylinder and the standard water level 15 of the water supply container become the same height. The water level of the water supply container 2 lowers to a water level 16 after water supply and the PET-bottle 3 discharges water when the water level of the flower cylinder 4 lowers to a water level 18 after water in the flower cylinder 4 evaporates. The discharge of water from the opening part 3a stops when the water level of supplied water of the flower cylinder 4 increases and the standard water level 17 of the flower cylinder and the standard water level 15 of the water supply container again become the same height.