A method for real-time master and slave information interaction, comprising: collecting, by N slave control Micro Control Units, MCUs, sensor signals of sensors respectively connected to the N slave control MCUs; feeding, by the N slave control MCUs, the sensor signals back to a master control MCU via a signal transfer board, wherein the signal transfer board is a board configured to transfer signals without any Central Processing Unit, CPU, or MCU; and issuing, by the master control MCU, a control instruction to a corresponding slave control MCU based on a preset condition once a sensor signal meets the preset condition, wherein the sensor signals and the control instruction are all transmitted between the master control MCU and the slave control MCUs via the signal transfer board in a form of SP signal; wherein the SP signal is a bidirectional signal and the slave control MCU scans the SP signal in a real-time manner, and executes a subsequent action according to a valid appointment for the SP signal; wherein after powering up, the master control MCU initiates broadcast communication by using the SP signal and a Controller Area Network, CAN, bus communication protocol; each of independent slave control MCUs enters into an interrupt receiving state after receiving the broadcast communication, and detects the SP signal sent by the master control MCU; in a case that the SP signal has a valid level, the slave control MCU receives data including a communication identifier of the slave control MCU sent from the CAN bus, and erases an address of the broadcast communication; in a case that the slave control MCU is abnormal and an internal state of the slave control MCU is not ready for communication interaction, the slave control MCU changes a state of the SP signal, and the master control MCU stops sending the broadcast communication in a case of detecting that the slave control MCU is abnormal. collecting, by N slave control Micro Control Units, MCUs, sensor signals of sensors respectively connected to the N slave control MCUs; feeding, by the N slave control MCUs, the sensor signals back to a master control MCU via a signal transfer board, wherein the signal transfer board is a board configured to transfer signals without any Central Processing Unit, CPU, or MCU; and issuing, by the master control MCU, a control instruction to a corresponding slave control MCU based on a preset condition once a sensor signal meets the preset condition, wherein the sensor signals and the control instruction are all transmitted between the master control MCU and the slave control MCUs via the signal transfer board in a form of SP signal; wherein the SP signal is a bidirectional signal and the slave control MCU scans the SP signal in a real-time manner, and executes a subsequent action according to a valid appointment for the SP signal; wherein after powering up, the master control MCU initiates broadcast communication by using the SP signal and a Controller Area Network, CAN, bus communication protocol; each of independent slave control MCUs enters into an interrupt receiving state after receiving the broadcast communication, and detects the SP signal sent by the master control MCU; in a case that the SP signal has a valid level, the slave control MCU receives data including a communication identifier of the slave control MCU sent from the CAN bus, and erases an address of the broadcast communication; in a case that the slave control MCU is abnormal and an internal state of the slave control MCU is not ready for communication interaction, the slave control MCU changes a state of the SP signal, and the master control MCU stops sending the broadcast communication in a case of detecting that the slave control MCU is abnormal.