The automatic unattended car wash machine is a high-end intelligent device that seamlessly integrates exquisite mechanical manufacturing with smart Internet of Things (IoT) technology. The system integrates full-chain automation features such as QR code payment, automatic reset, vehicle dimension recognition, and fault self-diagnosis, supporting 24/7 all-weather fully automatic operation. Car owners only need to scan a QR code with their mobile phones to independently and safely complete the entire “wash, care, and dry” process. Operators do not need to be on-site and can perform digital remote management through the cloud platform. This is a modern, large-scale commercial car wash solution that balances excellent cleaning experiences with low-cost operations.