The invention relates to a port shore power monitoring system, which comprises two station control servers, a plurality of monitors and a shore power variable-frequency power supply system which are sequentially connected, wherein the two station control servers are connected with an external network through a first switch and connected with the monitors through a second switch; and each monitor is connected with the shore power variable-frequency power supply system through a third switch and a fourth switch separately. Compared with the prior art, the port shore power monitoring system has the advantages that the condition that any primary server can be immediately switched into a standby server after being broken down is ensured by adopting primary and standby configuration and normal operation of the system is ensured; and same data are written into two primary and standby history servers at the same time, so that redundancy of the data is ensured and the security of the data is improved.