The present invention relates to an analytical pretreatment device, comprising a supporting material 1, m inlet ports 3 as fluid injection ports, n outlet ports 4 as fluid outlet port, m×n hollow filament 5 communicating between the inlet ports and the outlet ports, and n filler cartridges 6 connected to the outlet ports (wherein, m is a natural number; and n is a natural number) that provides an analytical pretreatment device allowing easier automation of the analytical pretreatment step for improvement in operational accuracy and saving in labor.