The invention provides a fax sending system and method. A judging module is used for dispatching a fax receiving number in a first database and respectively matching the fax receiving number with a preset fax number in a white list and a non fax receiving number in a blacklist; when the fax receiving number is matched with the preset fax number in the white list, a fax sending dispatching module is used for dispatching fax file information comprising the fax receiving number in the first database, converting fax file contents in the fax file information into fax file contents in a fax format, and sending the fax file contents in the fax format to a sending server corresponding to an operator corresponding to the preset fax number matched with the fax receiving number, and the corresponding sending server is used for sending the fax file contents to the fax receiving number through an operator circuit connected with the corresponding sending server; and when the fax receiving number is matched with the non fax receiving number in the blacklist, the flow is terminated. According to the fax sending system and method provided by the invention, the sending success rate is high.