The invention discloses an automatic production line for steel backing surface treatment. The automatic production line is used for transforming an existing steel backing surface treatment production line and comprises a steel backing cleaning machine, a steel backing sand blasting machine and a steel backing glue spraying machine and further comprises an automatic feeding and conveying device, a cleaning, sequencing and conveying device, a cleaning, discharging and conveying device, a sand blasting, feeding and conveying device, a sand blasting, discharging and conveying device, a transferring, sequenching and conveying device, a sorting, overturning and conveying device, a glue spraying and sequencing device and a drying, discharging and sorting device according to the production sequence. The automatic production line for steel backing surface treatment has the beneficial effects that full automation, automatic feeding, automatic sequenching, automatic transferring, automatic glue spraying, automatic drying and automatic sorting of steel backing surface treatment are achieved.