The invention discloses a security chip upgrading method and a device, and a security chip, the security chip is provided with a first memory area and a second memory area, the upgrading method comprises the steps of receiving a first instruction sent by an external device by the security chip, and the first instruction comprises a first task type; judging the state of the security chip; if the security chip is executing the second instruction in the second memory area, respectively obtaining a second task type corresponding to the second instruction, the priority of the second instruction andthe priority of the first instruction; and if the priority of the first instruction is higher than that of the second instruction, interrupting execution of the second instruction and executing the first instruction in the first memory area by the security chip. According to the security chip upgrading method, the device and the security chip provided by the embodiment of the invention, the security chip can immediately respond when receiving the task with the high priority in the task execution process, and the currently executed task is recovered after execution is finished, so that the working efficiency of the security chip is improved.