To provide a system for removing oil content of becoming the cause of clogging, stuck to filter cloth of a filter press, with a simple structure, without modifying the filter press itself, in the present invention.

A filter cloth clogging eliminating system of a filter press 17 of the present invention, is a filter cloth clogging eliminating system for cleaning the filter cloth built in the filter press, and one end of a cleaning liquid flow passage 18d for injecting a cleaning liquid 18a including a surface active agent, is connected to a waste liquid flow passage 13d for injecting a waste liquid into the filter press 17, and a cleaning liquid tank 18 for storing the cleaning liquid 18a is connected to the another end, and opening-closing valves 19a and 19b are provided in the waste liquid flow passage 13d and cleaning liquid flow passage 18d, respectively, and the waste liquid flow passage 13d and the cleaning liquid flow passage 18d are switchably configured.