The present invention discloses a wet-type dual-clutch automatic transmission churning loss measurement tool and method. A wet-type dual-clutch automatic transmission is connected with an input motorthrough a test connection plate to allow the wet-type dual-clutch automatic transmission to be operated under the drive of the input motor, and an output shaft and a difference velocity machine of thewet-type dual-clutch automatic transmission are respectively detachably connected with an output shaft oil baffle tool and a difference velocity machine oil baffle tool. The tool is simple in structure, easy to enforce and low in purchasing cost and can be used for simulation of different work conditions so as to facilitate test of churning loss of the automatic transmission in different work conditions. The measurement method provided by the invention can switch transmission gears or can change an oil temperature in a condition of keeping other conditions unchanged, can measure input torquesof the transmission in the conditions of different rotating speeds prior to and after transmission restructuring and can perform comparison of the input torques measured prior to and after transmission restructuring to obtain the churning loss, and therefore, the wet-type dual-clutch automatic transmission churning loss measurement tool and method can be taken as important basis of improvement ofa design and optimization of a design scheme through accumulation of test data.