The invention discloses a community access method and a fiber distribution system, relates to the communication network technology field and can solve a problem of poor business quality under the condition of relatively high business amount. According to the method, source radiofrequency signals of one community are respectively received by a main access unit and secondary access units, the received source radiofrequency signals are respectively converted into digital signals, the converted digital signals are respectively sent by the secondary access units to the main access unit, packing and framing of the received digital signals and digital signals of the main access unit are carried out by the main access unit, through an expansion unit, the digital signals after packing and framing are sent to a far-end unit. The community access method is suitable for community access.