Online pre-separation method of carbon fiber pretreatment columns with different properties and pre-separation device

The invention discloses an online pre-separation method of carbon fiber pretreatment columns with different properties. According to the online pre-separation method, different carbon fibers are prepared into the pretreatment columns, and eluting solvents with different polarities are used for sequentially eluting sample components in the pretreatment columns, so that the pre-selection of complicated samples is realized; and the online treatment of a sample pretreatment process and the microminiaturization of a pretreatment device are realized in short time, and the complicated samples can be comprehensively analyzed. The invention further discloses a special pre-separation device used in the online pre-separation method based on the carbon fiber pretreatment columns with different properties.