An information transmission method, applied to an ultrasonic wave transmitting device, comprising: transmitting (S11, S31), based on a preset received signal strength indication, RSSI, a Bluetooth wake-up signal to wake up an ultrasonic wave receiving device for receiving an ultrasonic transmission signal; obtaining (S12, S32) the ultrasonic transmission signal based on information to be transmitted; and transmitting (S13, S33) the ultrasonic transmission signal to the woken ultrasonic wave receiving device; characterized in that the information to be transmitted comprises more than one character arranged in sequence; wherein obtaining (S12, S32) the ultrasonic transmission signal based on the information to be transmitted comprises: obtaining an encoded ultrasonic signal by encoding the information to be transmitted; and obtaining the ultrasonic transmission signal by performing a digital-to-analog conversion on the encoded ultrasonic signal; wherein obtaining the encoded ultrasonic signal by encoding the information to be transmitted comprises: converting the more than one character into more than one frequency value in sequence based on correspondences between the characters and the frequency values; obtaining encoded subsignals corresponding to the characters based on the more than one frequency value; and encoding the encoded subsignals corresponding to the more than one character in sequence to form the encoded ultrasonic signal. transmitting (S11, S31), based on a preset received signal strength indication, RSSI, a Bluetooth wake-up signal to wake up an ultrasonic wave receiving device for receiving an ultrasonic transmission signal; obtaining (S12, S32) the ultrasonic transmission signal based on information to be transmitted; and transmitting (S13, S33) the ultrasonic transmission signal to the woken ultrasonic wave receiving device; characterized in that the information to be transmitted comprises more than one character arranged in sequence; wherein obtaining (S12, S32) the ultrasonic transmission signal based on the information to be transmitted comprises: obtaining an encoded ultrasonic signal by encoding the information to be transmitted; and obtaining the ultrasonic transmission signal by performing a digital-to-analog conversion on the encoded ultrasonic signal; wherein obtaining the encoded ultrasonic signal by encoding the information to be transmitted comprises: converting the more than one character into more than one frequency value in sequence based on correspondences between the characters and the frequency values; obtaining encoded subsignals corresponding to the characters based on the more than one frequency value; and encoding the encoded subsignals corresponding to the more than one character in sequence to form the encoded ultrasonic signal. obtaining an encoded ultrasonic signal by encoding the information to be transmitted; and obtaining the ultrasonic transmission signal by performing a digital-to-analog conversion on the encoded ultrasonic signal; wherein obtaining the encoded ultrasonic signal by encoding the information to be transmitted comprises: converting the more than one character into more than one frequency value in sequence based on correspondences between the characters and the frequency values; obtaining encoded subsignals corresponding to the characters based on the more than one frequency value; and encoding the encoded subsignals corresponding to the more than one character in sequence to form the encoded ultrasonic signal. converting the more than one character into more than one frequency value in sequence based on correspondences between the characters and the frequency values; obtaining encoded subsignals corresponding to the characters based on the more than one frequency value; and encoding the encoded subsignals corresponding to the more than one character in sequence to form the encoded ultrasonic signal.