A real-time weather forecast system and forecast method by using a rain-sensing device (1). Rain falling information in a specific region is collected by using the rain-sensing device (1), and is sent to a system for analysis, so as to forecast the weather in real time. The system comprises the rain sensing device (1), a vehicle-mounted control module (2), a vehicle-mounted display screen (3), a system data center (4), and a mobile terminal device (5), a signal input end of the vehicle-mounted control module (2) being connected to a signal output end of the rain sensing device (1), a rain falling signal sensed by the rain sensing device (1) being sent to the vehicle-mounted control module (2), the vehicle-mounted control module (2) performing data communication with the system data center (4) through a communication channel, and the system data center (4) sending, through the communication channel, data information obtained through processing to the mobile terminal device (5) or the vehicle-mounted display screen (3) connected to the system, thereby timely monitoring and releasing the weather condition.
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