The invention discloses a transvaginal volume probe comprising a shell body, a probe core part, a spindle, a drive motor and a transmission mechanism, wherein the spindle is rotatabely installed in the shell body, and the probe core part is fixedly installed on the spindle. The transvaginal volume probe is characterized in that the transmission mechanism comprises a trolling reel, a first stay wire, a first pulley block for guiding the first stay wire, a second stay wire and a second pulley block for guiding the second stay wire; the trolling reel is fixedly installed on the power output shaft of the drive motor; one end of the first stay wire is fixedly connected with the trolling reel, and the other end of the first stay wire is connected with the spindle or the probe core part; and oneend of the second stay wire is fixedly connected with the trolling reel, and the other end of the second stay wire is connected with the spindle or the probe core part. The transvaginal volume probe is characterized in that the pulley block and the stay wire form the transmission mechanism, so that the transvaginal volume probe has the advantages of simple and compact structure, easy assembly andlow manufacture cost. The reciprocating rotation of the power output shaft of the drive motor causes the probe core part to synchronously swing around the spindle, thus realizing body scanning and stable operation.