The invention provides a vehicle-mounted taxi booking device. The device comprises a receiver, a processor and a sender, wherein the receiver and the sender are connected with the processor; the receiver is used for receiving a taxi booking request sent by a passenger based on a V2X communication mode; the processor is used for carrying out order-competing operation after receiving the taxi booking request; and after an order is obtained successfully, the sender sends an order-competing success confirmation message to the passenger based on the V2X communication mode. According to the vehicle-mounted taxi booking device, the passengers are allowed to be directly communicated with taxis based on the V2X communication mode in the taxi booking process without depending on a base station of a mobile internet, thereby simplifying a communication mechanism; and besides, a control platform no longer needs to be established between the passengers and the taxis, thereby realizing a no-control-center taxi booking mode and improving taxi booking efficiency.