The utility model provides a tangential flow decarburization and filtering device applicable to high-concentration hydroxyethyl starch feed liquid. The tangential flow decarburization and filtering device comprises a barrel body, a barrel cover and a buffer and is characterized in that a liquid inlet, a flow returning opening and a pressure gage interface are arranged on the two sides of the barrel body, wherein a liquid outlet is formed in the barrel cover; the buffer is provided with a flow splitting board, a titanium rod mounting hole and a flow guide board. According to the decarburization and filtering device provided by the utility model, the problems of a traditional decarburization and filtering device that no return structure is arranged, a thick carbon layer is easy to form when the adding amount of active carbon is great, the filtering pressure of the sticky feed liquid is high are solved. Meanwhile, the device adopts a tangential flow to wash away a filtering medium, the carbon layer is not easy to form and the sticky feed liquid is easy to filter, so that the device is particularly applicable to the filtering of the high-concentration hydroxyethyl starch feed liquid.