This article studies the use of PLC ladder diagram programming to control the switch of the smart garage door. The system uses Mitsubishi FX series FX2N-16MR PLC, and at the same time chooses Aosheng/ AU-RK02-12 wireless remote control switch as the remote control. The owner can conveniently switch the garage door in the car. The power supply is MEAN WELL S -60-24 Single output switching power supply is used as the power supply of the garage door, equipped with buzzer, and the inside and outside of the garage are used as indicators, and finally a complete intelligent garage door control system is designed.