The invention discloses a processor chip simulator. The simulator includes a reset detection module, a management module, a simulation chip and an XRAM memory. The management module is internally provided with a randomizer; the simulation chip is linked with the XRAM memory and the management module through a standard data/address bus; the reset detection module is linked with the management module and the simulation chip through reset signal lines; the management module is capable of detecting the change of an input reset signal from a valid state to an invalid state and the change of the input signal from the invalid state to the valid state; when it is detected that the reset signal is changed from the invalid state to the valid state, the randomizer is controlled to generate a random number, and the random number is written into the whole area of the XRAM memory. The processor chip simulator can really simulate the function of changing a product chip XRAM module into a random number after the module is powered on again; taking into account the aspect of debugging and test of user codes, time consumption for resetting to the random number from the XRAM data is zero, and the property of the processor chip simulator is in accordance with that of a product chip.