The invention provides an electronic navigation map turning cost calculation method based on a floating car. The method comprises steps that floating car time space data in a city zone is extracted; coordinate system calibration pre-processing for the floating car time space data is carried out; registering for the floating car driving locus and an electronic map and path reconstruction are carried out; an average road segment driving speed and pass time are extracted; turning cost is calculated, and navigation information is provided. Rapid and accurate processing on the real-time GPS data and mass historical data of large-scale city taxis or buses can be realized, relatively rapid and accurate estimation on the city road speed can be realized, related traffic parameters are extracted, rationality and relevance of the city road network structure are analyzed, traffic induction, traffic management and traffic program services for large cities are realized, and service and application of the geographical information system in the traffic field are reinforced and promoted.