A pet water fountain comprising: a bucket configured to hold water; a pump positioned in the bucket ; an upper tray ; a water storage tray on top of the upper tray ; a filter being arranged between the upper tray and the water storage tray ; and a flower nozzle supported on top of the water storage tray ; wherein a pump outlet of the pump communicates with a water inlet of the water storage tray ; water in the bucket is pumped upwards from the pump outlet into the water inlet of the water storage tray , and then into the flower nozzle , and then falls on the water storage tray from the flower nozzle , and then flows from the water storage tray to the upper tray after being filtered by the filter and back into the bucket ; wherein the upper tray has a lap edge supported on a top of the bucket , and a recess is formed in the center of the upper tray , with a first hollow pipe being located in the center of the recess , and a plurality of through holes being formed on the recess around the first hollow pipe ; the filter is contained in the recess surrounding the first hollow pipe ; the water storage tray has a second hollow pipe extending downwards to go through the first hollow pipe to connect the pump outlet ; the flower nozzle has a plurality of spouts along its periphery and has a third hollow pipe extending downwards from the center of the flower nozzle to be inserted into the second hollow pipe of the water storage tray , and the flower nozzle further has a top cover covering on the top of the third hollow pipe ; water in the bucket is pumped upwards from the pump outlet into the second hollow pipe of the water storage tray and then into the third hollow pipe of the flower nozzle and then flows out from the spouts . a bucket configured to hold water; a pump positioned in the bucket ; an upper tray ; a water storage tray on top of the upper tray ; a filter being arranged between the upper tray and the water storage tray ; and a flower nozzle supported on top of the water storage tray ; wherein a pump outlet of the pump communicates with a water inlet of the water storage tray ; water in the bucket is pumped upwards from the pump outlet into the water inlet of the water storage tray , and then into the flower nozzle , and then falls on the water storage tray from the flower nozzle , and then flows from the water storage tray to the upper tray after being filtered by the filter and back into the bucket ; wherein the upper tray has a lap edge supported on a top of the bucket , and a recess is formed in the center of the upper tray , with a first hollow pipe being located in the center of the recess , and a plurality of through holes being formed on the recess around the first hollow pipe ; the filter is contained in the recess surrounding the first hollow pipe ; the water storage tray has a second hollow pipe extending downwards to go through the first hollow pipe to connect the pump outlet ; the flower nozzle has a plurality of spouts along its periphery and has a third hollow pipe extending downwards from the center of the flower nozzle to be inserted into the second hollow pipe of the water storage tray , and the flower nozzle further has a top cover covering on the top of the third hollow pipe ; water in the bucket is pumped upwards from the pump outlet into the second hollow pipe of the water storage tray and then into the third hollow pipe of the flower nozzle and then flows out from the spouts . <EOS>