Expressway new energy automobile electric quantity early warning system

The invention provides a highway new energy automobile electric quantity early warning system. The highway new energy automobile electric quantity early warning system comprises a new energy automobile terminal and a plurality of charging pile terminals which are in communication connection with each other. The new energy automobile terminal comprises a display module, a power supply module, an access module, a first positioning module, a calculation module, a first communication module and a voice module; and each charging pile terminal comprises a second positioning module, a second communication module and a charging pile information module. An algorithm stored in the calculation module is an improved shortest circuit algorithm based on a space-time network, which is provided on the basis that a space-time road network path in an expressway road network is attached to a physical network path, the characteristic of early departure and early arrival and the characteristic that no negative arc exists in the r