Force standard and force value measuring method using force standard

The invention relates to a force standard and a force value measuring method using the force standard, the force standard comprises a support, a rotating cylinder sleeve, a first piston and a second piston, the first piston and the second piston are in sealing fit with the upper end and the lower end of the rotating cylinder sleeve through corresponding first sealing rings, and the first piston and the second piston stop rotating relative to the support. The first piston, the second piston and the rotating cylinder sleeve define a piston cavity used for being filled with liquid, the force standard device further comprises a pressure sensor connected with the piston cavity, the support or the rotating cylinder sleeve is connected with an installation arm through a bearing, the axis of the installation arm and the rotating cylinder sleeve are coaxially arranged, and a force measuring component is arranged between the support and the installation arm. And a cylinder sleeve driving mechanism which is in transmiss