An automatic networking apparatus for a vehicle including a tractor and a trailer, wherein the automatic networking apparatus comprises a first identity recognition module disposed on the tractor and a second identity recognition module disposed on the trailer, wherein: the first identity recognition module comprises: a low-frequency sensor circuit configured to sense a low-frequency wake-up signal, wherein the low-frequency signal has a wireless transmission range shorter than a width of the vehicle body; a first high-frequency signal transmission circuit; and a controller configured to connect the low-frequency sensor circuit and the first high-frequency signal transmission circuit and respond to the low-frequency wake-up signal detected by the low-frequency sensor circuit and accordingly control the first high-frequency signal transmission circuit to transmit an identity code corresponding to the tractor; the second identity recognition module comprises: a low-frequency signal transmission circuit configured to transmit the low-frequency wake-up signal; a high-frequency signal receiving circuit configured to receive the identity code of the tractor sent from the first high-frequency signal transmission circuit; a second high-frequency signal transmission circuit; and a controller configured to connect the low-frequency signal transmission circuit and the high-frequency signal receiving circuit to activate the low-frequency signal transmission circuit and store the identity code of the tractor received by the high-frequency signal receiving circuit, wherein the second identity recognition module is configured to receive data collected from the trailer through the high-frequency signal receiving circuit and forward with the identity code of the tractor the received data through the second high frequency signal transmission circuit. the first identity recognition module comprises: a low-frequency sensor circuit configured to sense a low-frequency wake-up signal, wherein the low-frequency signal has a wireless transmission range shorter than a width of the vehicle body; a first high-frequency signal transmission circuit; and a controller configured to connect the low-frequency sensor circuit and the first high-frequency signal transmission circuit and respond to the low-frequency wake-up signal detected by the low-frequency sensor circuit and accordingly control the first high-frequency signal transmission circuit to transmit an identity code corresponding to the tractor; a low-frequency sensor circuit configured to sense a low-frequency wake-up signal, wherein the low-frequency signal has a wireless transmission range shorter than a width of the vehicle body; a first high-frequency signal transmission circuit; and a controller configured to connect the low-frequency sensor circuit and the first high-frequency signal transmission circuit and respond to the low-frequency wake-up signal detected by the low-frequency sensor circuit and accordingly control the first high-frequency signal transmission circuit to transmit an identity code corresponding to the tractor; the second identity recognition module comprises: a low-frequency signal transmission circuit configured to transmit the low-frequency wake-up signal; a high-frequency signal receiving circuit configured to receive the identity code of the tractor sent from the first high-frequency signal transmission circuit; a second high-frequency signal transmission circuit; and a controller configured to connect the low-frequency signal transmission circuit and the high-frequency signal receiving circuit to activate the low-frequency signal transmission circuit and store the identity code of the tractor received by the high-frequency signal receiving circuit, wherein the second identity recognition module is configured to receive data collected from the trailer through the high-frequency signal receiving circuit and forward with the identity code of the tractor the received data through the second high frequency signal transmission circuit. a low-frequency signal transmission circuit configured to transmit the low-frequency wake-up signal; a high-frequency signal receiving circuit configured to receive the identity code of the tractor sent from the first high-frequency signal transmission circuit; a second high-frequency signal transmission circuit; and a controller configured to connect the low-frequency signal transmission circuit and the high-frequency signal receiving circuit to activate the low-frequency signal transmission circuit and store the identity code of the tractor received by the high-frequency signal receiving circuit,