Tandem rainfall monitoring station and corresponding monitoring method

The invention discloses a tandem rainfall monitoring station and a rainfall monitoring method. The rainfall monitoring station comprises a sampling area expansion suite, a monitoring station host, monitoring station auxiliary machines and a power supply station. The monitoring station host is connected with the sampling area expansion suite, is connected with the power supply station, and is alsoconnected with at least two monitoring station auxiliary machines in series. A sampling inlet is formed in the upstream of the monitoring station host and is square so that the system error of pi value taking by the circular sampling port is avoided. The sampling area expansion suite is arranged at the upstream of the sampling inlet. According to the technical scheme, a package of solutions are provided for problems existing in rainfall monitoring, rainfall samples can be obtained according to time periods or rainfall requirements while the rainfall is monitored, the sampling port style is optimized, system errors are