Rock sample volume measuring device, measuring method and system

The invention provides a rock sample volume measuring device, method and system, the device comprises a measuring container, the measuring container comprises a container body and a cover body covering the opening part of the container body, the container body is internally provided with a first closed space, and the cover body is provided with a second closed space; a first sealing ring and a second sealing ring are concentrically arranged between the cover body and the end face of the opening of the container body, and a second closed space is defined by the first sealing ring and the second sealing ring. The reference container is communicated with the first closed space through an input pipeline; and the pressure detection assembly comprises a first pressure sensor arranged on the input pipeline and a second pressure sensor arranged in the second closed space. Based on the technical scheme, the sealing performance of the sealing ring structure can be accurately reflected according to the detection result