The utility model relates to a mechanical seal for a pump's seal face structure, including rotating ring and quiet ring, the rotating ring sets up in the axis of rotation of pump, rotates along with the axis of rotation of pump, and quiet ring sets up on the casing of pump, and both will produce relative motion rotating ring and quiet ring, and the rotating ring can be followed the axial and removed in a flexible way, makes rotating ring and the quiet ring production relative slip of closely laminating, still includes the rotating ring gabarit, the rotating ring gabarit sets up in the rotating ring circumference outside, and evenly distributed has several spiral shell hand groove on the rotating ring gabarit is preceding, through this technical scheme, on structural design, the problem that solid particle got into the sealed face of seal face fish tail has been solved to reinforce mechanical seal self cooling effect, when the pump sending contains the solid particle medium, reduced the reliance of washing pipe -line system to external world.