The invention provides a wireless mesh network deployment method and device in city environment. The method comprises: first step, selecting optional displacement point with largest coverage as the first wireless mesh network node displacement point; second step, selecting in turn optional displacement point satisfying following first condition as next displacement point for mesh network node until coverage of all selected wireless router achieving coverage goal; performing horizon communication with at least a wireless mesh network node displacement point of all selected wireless router displacement points; and the distance between optional displacement point and at least a wireless mesh network node displacement point is less than or equal to 3/2R, R representing of coverage radius of wireless mesh network node. In the invention, displacement points of wireless mesh network nodes are selected to comprehensively consider coverage demand and connection between wireless mesh network nodes so as to complete deployment of mesh network.