An underwater fish food feeder, which includes a barrel, a screw cap and a nozzle holder fastened to two distal ends of the barrel, the screw cap having a filling hole through which fish food is filled into the barrel and a connector connected to a high pressure air source, the nozzle holder holding a high pressure air control valve on the inside and a nozzle on the outside, a guide tube connected between the connector at the screw cap and an air inlet at thc high pressure air control valve, a nozzle tube connected to an air outlet at the control valve and suspended in the barrel, and a control button mounted in the high pressure air control valve and operated to open the air passage between the air inlet and the air outlet in the high pressure air control valve for enabling high pressure air to pass through the air nozzle tube into the barrel, to further force fish food out of the nozzle holder and the nozzle for feeding water animals.
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