Abstract: This article mainly introduces the design principle of the power module in the “pocket” laboratory,and validates the design circuit through the single chip computer.The power supply module is used as an energy supply device to meet the needs of other modules,and the USB data line is used for connecting the power module with the student's personal computer.The instrument display interface of the pocket lab can be arranged in the computer,and the control interface of the power module can be used for real time control of the hardware part and the power supply of the other modules.