The invention discloses a simulation method and a device of an optical lens. The simulation method and the device are used for solving the problems in the prior art that complexity of an optical lens simulation system is high and inconvenient to operate. The simulation method is that a parameter of visibility of the optical lens to a target, a coordinate of the visible target, an attribute identification parameter of the visible target, a measuring speed of the visible target and search time of the visible target are obtained according to a location parameter of the target and a location parameter of the optical lens; an optical lens simulation model is built according to the parameter of visibility of the optical lens to the target, the coordinate of the visible target, the attribute identification parameter of the visible target, the search time of the visible target and measuring speed of the visible target; an optical lens simulation parameter is preset in the optical lens simulation model, and search result of the target is input. According to the technical scheme of the simulation method and the device, the search results of the target can be obtained based on the location parameter of the optical lens and the location parameter of the target, and therefore the simulation method and the device achieves that the process is convenient and fast, and the operability is good.