The all-in-one POS is an integrated point-of-sale hardware terminal that combines touch display, mainboard processor, storage, thermal printer and rich peripheral interfaces into a compact single-body unit. Designed for retail shops, supermarkets, restaurants, cafes, convenience stores and catering businesses, it simplifies checkout deployment and saves counter space compared with traditional split-type POS systems. Featuring high-definition capacitive multi-touch screen with anti-fingerprint coating, it delivers responsive and smooth operation for cashiers. Optional customer-facing secondary display shows transaction details, unit price and total amount for shoppers. Powered by stable processor and SSD storage, the terminal supports long-hour continuous heavy-duty checkout with fast boot-up and quick-response data processing. Built-in high-speed thermal printer outputs receipts and order slips without ink cartridges. Abundant physical interfaces including USB, COM serial port, LAN Ethernet, Wi-Fi and Bluetooth support seamless connection with barcode scanners, cash drawers, POS scales, payment card readers and kitchen printers. It is compatible with mainstream Windows or Android operating systems, adapting to various POS management software for sales recording, inventory statistics, member management and data export. Fan-less heat-dissipation structure lowers noise and reduces hardware failure risk. Robust metal-reinforced housing resists scratch and wear for busy store environments. This all-in-one POS realizes one-machine checkout, effectively cutting hardware-matching workload and installation cost, and becomes a reliable intelligent checkout solution for modern retail and catering industries.