The invention discloses an intelligent rainfall monitoring system and an installation structure, wherein the intelligent rainfall monitoring system comprises an embedded ARM processing unit, a temperature sensor, a humidity sensor, an infrared detector, a photo sensor, an AD converter connected with an ultrasound water level detector, a combined aural and visual alarm, a color lattice liquid crystal display, a solenoid valve, a USB transfer device, an upper computer processing system and a calendar clock, and adopts multiple communication modes of wireless, serial ports, USB, RF(radio frequency) or Bluetooth wireless meter reading; a power supply adopts solar energy, a storage battery or alternating current; and a touch keypad and a touch screen keypad are adopted. A main support is installed on a base, the upper part of the main support is connected to a solar-cell panel, and the lower part of the main support is connected to the color lattice liquid crystal display, the embedded ARM processing unit, a function keypad and the temperature and the humidity sensors; and the main support is connected to a rain accepting device and a measuring cup by a plurality of auxiliary supports, the photo sensor is arranged on the rain accepting device, and an ultrasonic sensor is arranged on the upper part of the measuring cup.