The utility model relates to a mining liquid carbon dioxide equipment system that prevents putting out a fire, this system include carbon dioxide conversion equipment, carbon dioxide regulator, PLC control system and computer background system, and computer background system connects PLC control system, and PLC control system links carbon dioxide conversion equipment, carbon dioxide regulator respectively. The utility model discloses a control method who is used for mining liquid carbon dioxide equipment system that prevents putting out a fire has still been announced, with the control core of PLC controller as this system, the quick gaseous state CO2 that converts into with liquid CO2 can be realized to ensure to prevent the demand of putting out a fire at the in -process of mining, have high efficiency, advantage such as quick.