The invention relates to the technical field of monitoring systems, in particular to a condition acquisition controller (CAC) for power transformer equipment and a system control method. On a station level of an intelligent substation, the CAC for the power transformer equipment is connected with a comprehensive monitoring unit in the intelligent substation or an intelligent electronic device (IED) with the function of the comprehensive monitoring unit through an interface I1; and the CAC for the power transformer equipment is connected with a condition acquisition gateway (CAG) of a grid company in the province through an interface I2, so that the power transformation condition information can be accessed, and the aim of managing the condition information of the power transformer equipment can be fulfilled. The CAC has the complete functions of data analysis and diagnosis, the condition information of a primary device is provided, and the possible faults are pre-warned; and the health condition of the equipment is estimated. The CAC has significance to avoiding accidents of electrical equipment, and guaranteeing that the equipment is safe and reliable and runs normally.