The invention discloses an integrated circuit for driving and controlling stepping motors and fans. The integrated circuit comprises a USB to serial port module, a master controller, three two-phase hybrid stepping motor drivers, three fan control circuits, a switch power source, the three two-phase hybrid stepping motors and a low dropout linear regulator. One end of a USB to serial port line is connected with a PC, and the other end of the USB to serial port line is connected with a level conversion module. The level conversion module is connected with the master controller, one path of the master controller is connected with the fan control circuits, and the other path of the master controller is connected with the two-phase hybrid stepping motors of the three two-phase hybrid stepping motor drivers through the three two-phase hybrid stepping motor drivers. The switch power source supplies electricity to the three two-phase hybrid stepping motor drivers, and the low dropout linear regulator is connected with the USB to serial port module, the master controller and the three two-phase hybrid stepping motor drivers. The integrated circuit can meet the requirement for driving and controlling the three two-phase hybrid stepping motors and the three small USB fans.