The invention discloses an automatic out-of-box transparent paper splicing system which comprises a working disc, a standby disc, a paper rack position swing rod which is arranged between the working disc and the standby disc, and an automatic splicing device, wherein swing rod in-place sensors are respectively arranged between the paper rack position swing rod and the working disc as well as between the paper rack position swing rod and the standby disc; and signal output ends of the swing rod in-place sensors are connected with a swing rod in-place signal input end of a programmable logic controller (PLC). The automatic out-of-box transparent paper splicing system is provided with a plurality of sensors, and the PLC is used for judging signals of the sensors, so that the working disc and the standby disc can be automatically identified, and the accurate splicing program can be selected. Meanwhile, the PLC is used for automatically controlling all mechanical parts, so that transparent paper can be automatically spliced; the newly arranged standby disc can be simultaneously located; and the working disc and the standby disc can be switched at any time according to the signals which are manually input by a worker, so that the working efficiency and the splicing quality are greatly improved, the labor intensity of the worker can be lightened, and a great deal of manpower and material resources can be saved.