The utility model discloses a high-accuracy measurement device for grinding force, and belongs to the technical field of mechanical design. The measurement device comprises an installation base plate, a side plate, a bottom plate, a floating fixture, a movable sliding table, a single-axis force sensor, a fixture support and two three-axis force sensors. The side plate and the bottom plate are perpendicularly and fixedly connected to one side surface of the installation base plate, and the two planes where the side plate and the bottom plate are located are perpendicular to each other. The two three-axis force sensors are fixedly installed on the surface of the side, opposite to the bottom plate, of the side plate. The single-axis force sensor is fixedly installed on the installation base plate and located in the surrounding range of the side plate and the bottom plate. The fixture support is connected with the two three-axis force sensors through two installation planes respectively. The floating fixture is fixedly connected inside the fixture support. All the components are integrally connected to the movable sliding table through the installation base plate. According to the high-accuracy measurement device, the grinding force, in the direction X, the direction Y and the direction Z, borne by a work-piece in the precision and fine grinding process can be measured at the same time with high accuracy.