Navigation map updating method and device thereof based on GPS (Global Position System) navigating instrument

The invention discloses a navigation map updating method and a navigation map updating device based on a GPS (Global Position System) navigating instrument, and aims to solve the technical problem of the prior art that the navigation map route cannot be timely increased, compensated and updated. The navigation map updating method comprises the steps as follows: connecting a vehicle-mounted GPS navigating instrument with a route processing unit in a communicating manner; arranging a storage starting button and a storage finishing button on the vehicle-mounted GPS navigating instrument; starting the route processing unit when a destination cannot be searched from the vehicle-mounted GPS navigating instrument, thus sampling and recording the longitude and latitude of the route between the starting place to the destination based on points; adding the name of the starting place and the name of the destination after reaching the destination, and storing the name of the starting place and the name of the destination into documents with specified formats together; sequentially connecting the sampling points with longitude and latitude through tracks from the head to the end by utilizing the route processing unit based on the documents with the specified formats, so as to form a new navigation route; and transmitting the new navigation route to the vehicle-mounted GPS navigation instrument and the like.