The safety and reliability of AC/DC transmission and transformation equipment ensures safe operation of power grid. Security monitoring and control of AC/DC transmission and transformation equipment can find out faults in time and take measures correspondingly. On the basis of the existing research, reasonable monitoring items are chosen to reveal the hidden faults, and information with different data models are integrated by a unified common information model which is built based on CIM and SCL. In the end, security monitoring and control model of AC/DC transmission and transformation equipment is proposed to provide some meaningful advice on the construction of security monitoring and control system of AC/DC transmission and transformation equipment.