Viscosity testing device and method for mud retaining wall proportioning experiment

The invention relates to a viscosity testing device and method for a mud retaining wall proportioning experiment. The testing device comprises a stand, a vertical rod body, a fixing clamp, a funnel, a measuring cup, a timer and a piston, the stand is detachably and fixedly connected with the vertical rod body; a fixing clamp is fixedly arranged on the vertical rod body; one end of the fixing clamp is fixed on the vertical rod body, and the other end is used for fixing the funnel; a measuring cup is arranged below the funnel and is used for receiving the slurry leaked from the funnel; a hole matched with the piston is formed in the leakage neck of the funnel, the piston is inserted into the hole, and a through hole is also formed in the piston; switches of the timer are arranged at two ends of the piston. One end of the piston is connected with a first push-pull motor, and the other end is connected with a second push-pull motor; the first push-and-pull motor and the second push-and-pull motor are connected to