The utility model discloses an automobile RKE emission module. HCS300 chip, A pin 1 of the HCS300 chip is connected with a pin 2 of the HCS300 chip. 2 and 3 are respectively connected with the SW3; the SW2 and the SW1 are electrically connected in series; SW3, The SW2 and the SW1 are connected with a pin 8 of the HCS300 chip through wires. a pin 8 of the HCS300 chip is connected with a resistor R1and a positive electrode of a BAT1 power supply; the resistor R1 is connected with the anode of the light emitting diode in series; the cathode of the light emitting diode is connected with the pin 7of the HCS300 chip; a pin 6 of the HCS300 chip is electrically connected with a resistor R2 in series; wherein the resistor R2 is connected with a base electrode of the triode Q1 and a pin 5 of the surface acoustic wave resonator in series, pins 1, 2, 3, 4 and 6 of the surface acoustic wave resonator are all grounded, an emitting electrode of the triode Q1 is connected with the resistor R3 in series, the resistor R3 is grounded, and the resistor R3 is connected with the capacitor C5 in parallel. According to the automobile RKE transmitting module, the RKE transmitting module needs small current and is low in power consumption, and the service life of a battery is prolonged.