The invention belongs to the technical fields of advanced manufacturing and automatic control and particularly relates to a synchronous control system for multi-axis brushless direct current motors. The system comprises a plurality of DSP (Digital Signal Processor) controllers, a plurality of motor status collection circuits and a plurality of brushless direct current motor drive circuits. The system is characterized by further comprising a controller synchronous circuit, wherein the controller synchronous circuit comprises a clock chip, an FPGA (Field Programmable Gate Array) chip and a plurality of RAM (Random Access Memory) chips; a clock signal input end of the FPGA chip is connected to the clock chip; the RAM chips are all connected to the FPGA chip through data signal interfaces and address interfaces thereof; each DSP controller is connected to the FPGA chip through a data signal interface, an address signal interface, a clock line signal interface and a synchronizing signal interface. The system effectively solves the problems of many kinds of components of the synchronous control system, complicated hardware wiring and larger synchronization delay.