Anti-collusion early warning method, device, equipment and system

The invention discloses an anti-collusion early warning method. The method comprises the following steps: binding anti-collusion equipment of at least two persons belonging to the same case; when it is detected that the anti-collusion supply equipment enters a preset detection range, judging whether another anti-collusion supply equipment bound with current anti-collusion supply equipment exists in the detection range or not; if so, detecting a linear distance between the two bound anti- collusion equipment; if not, continuously detecting whether another anti- collusion equipment bound with the current anti-collusion equipment exists in the detection range or not is; and when the linear distance is smaller than a preset distance threshold, sending out an anti-collusion early warning prompt. The invention further discloses an anti-collusion early warning device, anti-collusion early warning equipment and an anti-collusion early warning system. By adopting the embodiment of the invention, the position informati