The embodiment of the invention discloses a master-slave information real-time interaction method which is used for reducing the interaction between redundant information and improving the communication efficiency and can be applicable to the occasions of real-time rapid response. The master-slave information real-time interaction method comprises the steps that N slave control MCUs collect the sensor signals of sensors connected with the slave control MCUs respectively; the N salve control MCUs feed the sensor signals back to a master control MCU through a signal adapter plate; when the sensor signals meet the preset condition, the master control MCU transmits control instructions to the corresponding slave control MCUs according to the preset condition; the sensor signals and the control instructions are transmitted between the master control MCU and the slave control MCUs in an SP signal mode through the signal adapter plate. The embodiment of the invention further provides a master-slave information real-time interaction system. According to the master-slave information real-time interaction method and system, the interaction between the redundant information can be reduced, the communication efficiency is improved, and the master-slave information real-time interaction method and system can be applicable to the occasions of real-time rapid response.