Mechanical seal device

The invention provides a mechanical sealing device. A rotation sealing ring (10) and a stationary sealing ring are matched correspondingly in an embedded clearance between a rotation shaft and a shell. The invention comprises the rotation sealing ring (10) which is connected with the rotation shaft; the invention is provided with a rotation sealing surface (11) which is provided with a plurality of arc-shaped ditches (12) which take the axis line of the rotation shaft as a center and are circularly configured and formed by the dividing of a separation wall (13); the invention also comprises the stationary sealing ring which is provided with a stationary sealing surface which is opposite to the rotation sealing surface (11) of the rotation sealing ring (10), a spring which pushes and presses the stationary sealing ring to the rotation sealing ring and an output opening part which is formed on the stationary sealing surface of the stationary sealing ring and can be communicated with a fluid supply passage which is used for supplying a pressure fluid; the circumferential length (W3) of the output opening part is more than 1/2 of the circumferential length (W1) of the separation wall (13) (W3 is more than or equal to W1/2); the circumferential length (W3) of the output opening part is less than the circumferential length (W2) of the arc ditch (12) (W3 is less than W2).