A wireless discrete narrow-band frequency spectrum polymeric CPE (Customer Premise Equipment) terminal supporting wifi access comprises a boxy terminal body, wherein at least two wifi antenna interfaces, one broadband system antenna interface, one power interface and a power switch are arranged on the boxy terminal body; a CPE terminal body comprising three parts, namely a wifi access function module, a digital processing unit and a radio frequency unit, is arranged in the boxy terminal body; the wifi access function module is used for receiving wifi signals of a trade terminal, converting the wifi signals, sending converted signals into the digital processing unit via a cable for processing, receiving signals of the digital processing unit, converting the signals into wifi signals, sending converted wifi signals to the trade terminal, so as to realize wireless connection between the CPE terminal and the trade terminal; and the radio frequency unit is used for power amplification of downlink signals of a broadband system and low-noise magnification of uplink signal of the broadband system, converting analog signals and digital signals, and filtering discrete frequency spectrum signals.