The invention discloses a communication rate setting method for a safety chip; the communication rate setting method is applied to ISO7816 communication means and includes: setting, in the safety chip, basic command parameters of communication rate, wherein the basic command parameters are used for setting communication rates in different communication modes; transmitting, by an interface device,a communication rate command to the safety chip; executing, by the safety chip, the communication rate command so as to set the communication rate. The communication rate setting method allows free switching of communication modes and therefore is applicable to diversified application scenes.