The invention discloses an automatic rocky total-organic carbon test sample pretreatment device and method. Inorganic carbon in rock samples is removed by the aid of diluted hydrochloric acid according to automatic digital management operation processes, and the content of total-organic carbon in rocks is measured by the aid of a carbon-sulfur detector, so that samples are treated and prepared. The device comprises a reaction liquid loading system, an acid treatment reaction system, a reaction abandon liquid discharging system, a reaction end identification system and an operating control system, the liquid loading system comprises a diluted hydrochloric acid tank, a cleaning liquid tank, a manipulator sliding rail, a manipulator, a first liquid transportation pipeline, a second liquid transportation pipeline, a liquid circuit conversion switch and a plurality of liquid loading ports, the acid treatment reaction system comprises a sample tray, a heating body and a plurality of sample tanks, the reaction abandon liquid discharging system comprises an abandoned liquid warehouse, a third liquid transportation pipeline and an abandoned liquid collecting container, the reaction end identification system comprises a pH (potential of hydrogen) electrode and a plurality of carbon dioxide sensors, and the operating control system comprises a computer, an intelligent switch, a digital communication component and operating software.