The invention discloses a system for collecting a water droplet distribution pattern of a target object: a positioning device transmits position information of a flight device through a communicationdevice, and a control device transmits a flight control command of the flight device through the communication device to control the flight state of the flight device. A distance measuring device measures a distance between the flight device and a surrounding object. When the distance between the flight device and the surrounding object is lower than a safe distance, a flight control command is sent by the control device to adjust the flight state of the flight device; a water spraying device according to a spraying control command sprays water mist on the target object, and stops the sprayingof the water mist on the target object after water droplet distribution on the surface of the target object is formed; an image acquiring device acquires an image of the target object after water droplets are formed on the surface according to an image acquiring control command, and the image is sent to an analysis device through the communication device; the analysis device analyzes the water repellency level of the target object according to the image of the target object.