The utility model belongs to the technical field of UPS control, the utility model provides a can carry out the uninterruptible power supply power monitoring system that monitors to the load, include: module, insulating monitoring module, temperature monitoring module, storage module, alarm module, communication module and display screen module are patrolled and examined to main control unit module, rectification control module, contravariant control module, battery, also including: current detection module, voltage testing, signal conditioning module, AD conversion module, zero-crossing detection module, lock-in amplifier module and select looks circuit module, the utility model is suitable for a the electricity sector.