The invention provides a taxi trip charging method, a taxi trip charging device and a taxi trip charging system. The taxi trip charging method comprises the following steps of: identifying information of a starting position and a destination in a voice signal; transmitting the information of the starting position and the destination to an electronic map device; receiving trip information returned by the electronic map device; and displaying a drive route and drive cost to a client according to the trip information. The taxi trip charging method provided by the invention comprises the following steps of: identifying information of the starting position and the destination in the voice signal; transmitting the information of the starting position and the destination to the electronic map device so as to inquire the optimal drive route and drive mileage; calculating the drive cost; and displaying the drive route and the drive cost to the client, so that a passenger and a driver of a taxi can acquire the drive route and the drive cost clearly, and the condition of dispute over the drive route between the taxi driver and the passenger is avoided.