The utility model provides a stepping motor drive circuit for downhole control execution systems. It includes motor control unit, power driving unit, current detection unit and power management unit,motor control unit connects power driving unit, and power driving unit connects step motor, and step motor connects actuating mechanism in the pit, current detection unit connection power driving unitand motor control unit, and power management unit connects motor control unit, power driving unit and current detection unit. The utility model discloses the effect: setting up the frequency of operation of motor by motor control unit, corresponding the switch -on and the shutoff of phase line by power driving unit driving motor, carry out the step motor rotary speed control through design current detection unit, the position accuracy is high, the motion good reproducibility, and intelligent tool's direction drive, on -off control in -process have good application prospect in the pit.