The invention discloses a detachable extraction premixing and filtering device, comprising a main pipe, a contraction pipe, a liquid spray pipe, a ring pipe, a first spoiler, a U-shaped slide way, a filtering mechanism and a second spoiler; a raw material is input through the contraction pipe and the liquid spray pipe, and is sprayed out through first liquid spray holes; an extraction agent is input into the ring pipe and is sprayed out through second liquid spray holes; the axis of the liquid spray pipe is coincided with that of the ring pipe, so that the raw material sprayed out through the first liquid spray holes and the extraction agent sprayed out through the second liquid spray holes continuously flow out through third liquid spray holes formed in the first spoiler after being fully mixed together, then flow out through the filtering mechanism, and finally flow out after being subjected to turbulence mixing of the second spoiler. The device is simple in structure; the raw material and the extraction agent are fully mixed together in a state of turbulence, so that the extraction efficiency is greatly improved; furthermore, by adopting the detachable filtering mechanism which is convenient to maintain, so that the device is good in filtering effect and convenient and fast to maintain.