The invention provides a system for monitoring a data port of a power grid control terminal. The system comprises a chassis, a processing chip, a data host computer, a data port lock, a control module, an authorizing module and a monitoring module, wherein the processing chip is used for processing data; the data host computer is connected with the processing chip; the data port lock is arranged on the data port and is used for locking the data port of the chassis and protecting the safety of the data port; the control module is used for controlling the locking of the data port physical lock; the authorizing module is used for authorizing the operation of the data port; the monitoring module is used for monitoring the abnormal operation of the data port and alarming the abnormal operation of the data port. Based on the combination of hardware and software, the monitoring system for the data port of the power grid control terminal provided by the invention can protect the safety of the power grid-side control computer data port, can timely alarm the abnormal operation of the data port and can self-destroy the data through an internally set self-destroying program in case of serious safety problem so as to further protect the safety of power grid data.