The portable drone detector adopts a low-power design and highly integrated design, and is capable of detecting mainstream rotary wing drones such as DJI and AUTEL that use OFDM high-definition image transmission, as well as various DIY crossings that use analog image transmission signals. The device adopts dual antennas and multi-channel simultaneous scanning, which has the characteristics of fast detection speed, high detection sensitivity, long detection distance, low false alarm rate, strong scalability, and easy use.