The invention provides a displacement/angle measurement device and method. The displacement/angle measurement device comprises a transmission portion, a first rheostat and a measuring unit. The transmission portion is connected between the first rheostat and a displacement/rotation main body; resistance of the first rheostat changes with the displacement/rotation main body; and the measuring unit is connected with the adjustment end of the first rheostat and is used for measuring the resistance change amount of the first rheostat and calculating the displacement/rotation angle of the displacement/rotation main body according to the resistance change amount. The displacement/angle measurement device is low in cost and high in precision.