A sealing pressing head for a conventional triaxial test of cuboid rocks with pre-existing fissures, and a test method, the sealing pressing head comprising an upper pressing head (14) and a lower pressing head (15); the upper pressing head (14) and the lower pressing head (15) are respectively used for being provided at upper and lower ends of a test sample (10); the upper pressing head (14) comprises a circular portion (2) and a square portion (1) which are provided in sequence from top to bottom; and the lower pressing head (15) comprises a square portion (1), a circular portion (2) and a threaded portion (3) which are provided in sequence from top to bottom.
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