The invention discloses a radar networking communication method, a radar and a terminal device. The radar networking communication method applied to a terminal device comprises: at least two radars for controlling a terminal device are determined; communication with an information transceiver of the terminal device is carried out by a secondary radar channel of each radar and communication connection between the at least two radars is established, wherein the secondary radar channel is formed by integration of a primary radar antenna and a secondary radar antenna and the primary radar antenna and the secondary radar antenna share one radio-frequency front-end module. Therefore, technical problems of lots of system units, high cost, and low reliability in existing radar networking communication can be solved; and the system unit number is reduced, the cost is lower, and the system reliability is improved.