The invention provides a high-antitheft-level double-lock latch mechanism which comprises a latch and a double-lock device. The latch is mounted on a lock mounting plate, a first baseplate, a double-lock latch plate and a second baseplate are sequentially overlaid and fixed on the lock mounting plate, double-lock latches are arranged on two sides of the top end of the double-lock latch plate respectively and include a first double-lock latch and a second double-lock latch, the bottom end of a double-lock retaining plate is fixedly connected on the second baseplate, the double-lock retaining plate comprises a first double-lock column and a second double-lock column, a groove is arranged on each of the first double-lock column and the second double-lock column, two ends of a double-lock spring are connected with the first double-lock column and the second double-lock column respectively, the top ends of the first double-lock column and the second double-lock column are fixedly connected through a retaining plate, and a double-lock module is arranged at each of two ends of the retaining plate. The high-antitheft-level double-lock latch mechanism is high in double-lock sensitivity, high in adaptability, capable of effectively stopping safes from being abnormally opened, light and flexible, capable of being mounted on doors of the safes different in volume and suitable for high-level antitheft safes.