The invention provides a drinking device for pets in a cup.The utility model is mainly composed of an inner cup and an outer cup with a water outlet pipe.Make this creation pour down into the inner cup through the water outlet of the water pipe.At the same time, the waste material such as feed left inside is flushed out and flows into the overflow drainage tank with water.Then discharge along the outlet pipe and drain pipe.After the residue of the inner cup is removed by flushing,And the drinking water retained in the interior can achieve the effect of clean water quality.And a guide through space is arranged by the supporting ring of the outer cup.The limiting clamp of the inner cup and the guide group against the ring edge can be provided and rotated for installation.So that the inner cup can be positioned at the outer cup.In order to prevent the difficulty of cleaning the inner cup caused by the bird pet taking it away.本創作係提供一種杯中杯寵物飲水裝置，其主要係藉由一內杯與一設有出水管之外杯相對旋位固定而成，使本創作藉由水管之出水部向下注入該內杯內，並同時藉此沖力將內部殘留的飼料等穢物沖出並隨水流入該溢流排水槽，繼而順著出口管及排水管排出，而使該內杯藉由沖除殘餘後，而使保留在內部飲用水可達到水質乾淨之功效，且藉由該外杯之抵靠環設置一穿導空間，可提供該內杯之限位卡件及抵靠環緣導組其中並旋位安裝，以使該內杯可確實旋位卡組定位於該外杯，以防止內杯因遭到鳥類寵物叼走而造成清洗內杯之困難者。
