A portable water feeder for pets comprises a water storage bottle and water tray for pets which are rotabably connected mutually by shaft hole and pivot (24, 34), characterized in that: it also comprises a stopper and curved sliding surface set on the inner base of the said water tray, the main body of the said bottle stopper has a hollow cylindrical shape whose middle section is set with radial outlet holes, the main body of the bottle stopper is inserted into the water storage bottle mouth, which shares the central axis with the water storage bottle; when the said water storage bottle is in the closing state, the head of the bottle stopper will press against the root of the said curved sliding surface, the whole body of the water storage bottle is stuffed into the said water tray, the body of the said bottle stopper is pressed into the water storage bottle moth, so that the water flow path between the said water storage bottle and water tray can be sealed and water cannot leak from the water storage bottle; the water storage bottle is rotated round the said pivot on the vertical surface perpendicular to such pivot, the head of the bottle stopper slides from the root of the said curved sliding surface downwards to the oblique surface at the near end, when the said water storage bottle is rotated until perpendicular to the base of the said water tray, the body of the said bottle stopper is still inside the water storage bottle mouth; the water storage bottle is continued to rotate in the original direction until it is in use, its central axis and the base of the said water tray intersect at an obtuse angle of δ; and under the pressure arising from the water storage bottle squeezed, the water stopper will move a distance along its own axis towards the outside of the said bottle mouth, so that the water flow path between the said water storage bottle and water tray can be clear and water flows from the said water storage bottle can flow into the said water tray for pets to drink; when the water storage bottle is ceased to be squeezed, water will stop flowing into the said water tray; after pets finish drinking water in turn, the water storage bottle shall be rotated in the opposite direction to enable it to return to the said closing state. it also comprises a stopper and curved sliding surface set on the inner base of the said water tray, the main body of the said bottle stopper has a hollow cylindrical shape whose middle section is set with radial outlet holes, the main body of the bottle stopper is inserted into the water storage bottle mouth, which shares the central axis with the water storage bottle; when the said water storage bottle is in the closing state, the head of the bottle stopper will press against the root of the said curved sliding surface, the whole body of the water storage bottle is stuffed into the said water tray, the body of the said bottle stopper is pressed into the water storage bottle moth, so that the water flow path between the said water storage bottle and water tray can be sealed and water cannot leak from the water storage bottle; the water storage bottle is rotated round the said pivot on the vertical surface perpendicular to such pivot, the head of the bottle stopper slides from the root of the said curved sliding surface downwards to the oblique surface at the near end, when the said water storage bottle is rotated until perpendicular to the base of the said water tray, the body of the said bottle stopper is still inside the water storage bottle mouth; the water storage bottle is continued to rotate in the original direction until it is in use, its central axis and the base of the said water tray intersect at an obtuse angle of δ; and under the pressure arising from the water storage bottle squeezed, the water stopper will move a distance along its own axis towards the outside of the said bottle mouth, so that the water flow path between the said water storage bottle and water tray can be clear and water flows from the said water storage bottle can flow into the said water tray for pets to drink; when the water storage bottle is ceased to be squeezed, water will stop flowing into the said water tray; after pets finish drinking water in turn, the water storage bottle shall be rotated in the opposite direction to enable it to return to the said closing state.