An automatic sampling treatment device comprises a motor for taking a liquid sample and a filter head, a manipulator up-down moving motor, a first manipulator rotating motor, a nitrogen blowing pipe,an air pump, a fixed seat, a manipulator and a driving assembly, a controller used for controlling equipment is arranged on the fixed seat, and the driving assembly is arranged on the fixed seat and is in communication connection with the controller; the liquid sample taking and filtering head motor, the manipulator up-down moving motor and the first manipulator rotating motor are arranged on thedriving assembly through a bracket frame; an initial sample bottle fixing disc, a sample bottle cap fixing disc, a sample injection bottle fixing disc, a sample injection bottle cap fixing disc and aneedle head filter fixing disc are arranged on the fixed seat side by side; and the nitrogen blowing pipe is arranged on the bracket frame through a bracket and is positioned right above the initial sample bottle fixing disc. The sample sampling treatment automation degree is high, sample pretreatment automation is achieved, the sample injection bottle which can be directly detected on a machine and is provided with an analysis sample is obtained, the speed is high, the precision is high, and the working efficiency is high.