The invention discloses a system and a card-reading method for RFID (Radio Frequency Identification Devices) remote-distance card-reading. The system comprises a data collector, a card reader and a radio frequency card, wherein the data collector adopts an ARM (Advanced RISC Machines) processor and is connected with the card reader by an RS485 communication interface; the card reader comprises a singlechip and a radio frequency circuit, receives data sent by the radio frequency card and responds to the radio frequency card; the radio frequency circuit is provided with a plurality of channels for reading the data of the radio frequency card and sending the data to the radio frequency card; the radio frequency card adopts an active RFID card; the radio frequency card has a carrier signal detection function and a channel idle evaluation function; and the carrier signal detection function is used by the radio frequency card to judge whether the radio frequency card enters a card-reading zone. According to the invention, low energy consumption and the function of preventing collision confliction can be realized, card-reading distance is long, card-reading efficiency is greatly improved, and requirements on card-reading space are much lowered.