The invention discloses a distributed cooling pump controller of a central air conditioner. The controller comprises an STM32F103V676 single-chip microcomputer and a power module, wherein the single-chip microcomputer is connected with an outdoor environment acquisition module through an RS485 interface, the single-chip microcomputer is connected with an isolation CAN circuit through a CAN bus, the single-chip microcomputer is connected with an RS232 circuit and a feedback data acquisition module through data lines, the single-chip microcomputer is connected with a host communication module, a power acquisition module and a signal output control module respectively through SPI buses, and voltage and current signal conversion circuits are arranged in both the signal output control module and the feedback data acquisition module. The controller is low in cost, multiple in function, stable in performance, high in accuracy, long in service life and good in energy-saving effect.