Abstract: A viscosity measurement device and a method for measuring viscosity are provided. The viscosity measurement device includes a measurement container and an optical detection processing device. The measurement container accommodates a substance to be measured and a ball. The optical detection processing device includes an optical detector, a processing unit, a database, a controlling unit and a power supplying unit. The optical detector is disposed at a side of the measurement container to obtain an image to be analyzed from the measurement container. The processing unit is signally connected to the optical detector to process and analyze the image to be analyzed. The database stores the image to be analyzed. The controlling unit is connected to the optical detector and the processing unit to control the optical detector and the processing unit. The power supplying unit provides power for the optical detector, the processing unit and the controlling unit.