The invention discloses a tea garden empoasca flavescens monitoring device and method based on color plate induced counting. The tea garden empoasca flavescens monitoring device based on color plate induced counting comprises a color plate assembly and a monitoring assembly, wherein the color plate assembly comprises an orange plate, a first fixing rod, a first fixing block, a telescopic rod, a guide rod, a second fixing block, a second fixing rod and a fixing mechanism; and the monitoring assembly comprises a solar panel, a box body, a processor, a third fixing rod, a camera, a first carrier plate, a moving rod, a cylinder body, a second carrier plate and supporting legs. The orange plate is specially designed for empoasca flavescens, facilitates identification of the empoasca flavescens, the camera and other devices replace manual work to monitor the orange plate in real time, images collected by the camera are transmitted to the processor, the number of pests on the orange plate is calculated through a target identification algorithm and a counting algorithm in the later period, then the pest situation is forecasted, and the pest situation dynamic of the tea garden empoasca flavescens can be mastered in real time.