The invention discloses a latitude and longitude vehicle spacing measuring system based on a filter circuit. The system comprises a positioning module, a radio frequency transmit-receive module, an analog to digital conversion circuit, a filter circuit, a display module, a microcontroller module and a power supply module. The positioning module and the radio frequency transmit-receive module are connected with the microcontroller module through the analog to digital conversion circuit and the filter circuit connected in order. The display module and the power supply module are connected with corresponding ports of the microcontroller module. A longitude and latitude of a vehicle are obtained in real time through the positioning module, longitudes and latitudes of vehicles around the vehicle are received through the radio frequency transmit-receive module, furthermore distances of the vehicle and the vehicle around are obtained precisely through calculation, and therefore a driver can be reminded to pay attention to vehicle spacing well.