The invention provides an agricultural water conservancy power intelligent centralized control system and a method; the system comprises an advanced risc machines (ARM) processor; the ARM processor is connected with a cell phone card module, a photoelectric coupling device, an analog-to-digital converter, a rechargeable lithium battery and a double data rate random access memory (DDR RAM); the photoelectric coupling device is also connected with a switching quantity input and output module; the analog-to-digital converter is connected with an analog input module; and the analog input module is respectively connected with a voltage transformator and a current transformator. The agricultural water conservancy power intelligent centralized control system can manage the power consumption of the power equipment in the field of agricultural water conservancy conveniently and flexibly.