The invention relates to a plasma display power supply timing control device which comprises a micro processor IC1, a signal control unit and a voltage output end, wherein the micro processor IC1 receives a control signal of the signal control unit and controls the voltage output of the voltage output end; and the signal control unit receives a command signal of the power supply and controls the power supply voltage to be output in terms of the power supply voltage timing sequence set in the TC1 according to the command signal of the power supply. The plasma display power supply timing control device is constructed and adopts the micro processor IC1 for centralized control so as to accurately control the timing sequence of the power supply when the plasma panel display is turned on or off, and provide the functions of overvoltage protection, under-voltage protection and output short circuit protection for the voltage output by a power module. The technical proposal adopts fewer elements, and has low failure rate and cost.