Check valve structure

The utility model discloses a check valve structure which comprises a valve body and a valve clack, a connecting rod is arranged at the top of the valve clack, the connecting rod is hinged to the valve body, an opening and closing flow channel cavity is formed in the valve body, a valve seat matched with the valve clack is arranged on one side of the opening and closing flow channel cavity, and a plurality of first tooth rings are coaxially arranged on the end face of the valve seat. A plurality of second tooth rings in one-to-one correspondence with the first tooth rings are arranged on the side, facing the valve seat, of the valve clack, and the second tooth rings abut against the first tooth rings when the valve clack is closed; according to the check valve, the valve seat is in contact with the valve clack through the first tooth ring and the second tooth ring, when the valve clack falls down, impurities in oil are not prone to staying at the contact point of the first tooth ring and the second tooth ring