The invention discloses a hydropower station field standardized operation management and control system and method. The system comprises an operation and inspection operation library module, a plannedtask module, a field execution module and a mobile operation terminal, wherein the data of the planned task module is generated according to the data of the operation and maintenance operation library module, the data of the field execution module is generated according to the data of the planned task module, and the mobile operation terminal acquires the overhaul and maintenance work order in the field execution module and synchronously uploads the field operation data. Guided by operation regulations, a device tree acts as a framework. The field operation instruction is a gripper and a daily risk pre-control list is a guarantee. The mobile operation terminal is a supported operation risk management and control and operation inspection quality guarantee system. The mobile terminal completes on-site operation such as overhaul and maintenance data recording, synchronizes the data recording with the production management system, effectively controls the safety production risk, realizesthe on-site standardized operation process, reduces the failure rate, improves the reliability of unit operation, and provides support for standardization and lean of operation and maintenance management.