The invention provides a transporter in a rail transporting cart and a rail transporting system. The transporter is used for loading and unloading of paper product goods, and arranged in a goods storing compartment in the rail transporting cart, and comprises a support, a plurality of antistatic rollers, a transporting power unit, a positioning unit and a transporting control unit. The support isfixed to the bottom of the goods storing compartment; the antistatic rollers are parallel to one another and rotatably arranged on the support; the transporting power unit is fixed to the support; thepositioning unit comprises at least one set of photoelectric sensors and a Bluetooth sensor; a transporting control unit is connected with the transporting power unit and the positioning unit and used for controlling the transporting power unit to operate, each photoelectric sensor comprises a set of diffuse reflection type photoelectric sensors and two sets of bijection type photoelectric sensors, a transmitting terminal is mounted at the center of the support and located between the two rollers, a receiving terminal is arranged over the position, higher than goods, of the transmitting terminal, and the goods storing compartment is provided with two openings allowing the goods to go in and out; and the two sets of bijection type photoelectric sensors are located at the two openings correspondingly, a Bluetooth transmitting module is arranged on an external conveying device, and a Bluetooth receiving module is arranged in the transporting control unit.