The invention discloses a washing device and a washing method adopting same. The washing device is characterized in that a first washing tank body is positioned into a first space in a protecting cavity, and a second washing tank body is positioned into a second space in the protecting cavity, wherein the first washing tank body and the second washing tank body are separated through a separating device; the separating device comprises a separating article and a separating container; one end of the separating article is positioned in a the separating container while the other end of the separating article is fixed to the top part of the protecting cavity; if separating liquid is in the separating container, the first space and the second space are separated through the separating article; when in washing, the first washing tank body is moved out and placed into the separating container after the washing, and an article to be washed is conveyed from one side, positioned in the first space, of the separating container, to one side of the second space; the article to be washed is moved out from the separating container and then placed into the second washing tank body. With the adoption of the washing device, the problems of cross contamination of washing liquid and the safety in washing can be solved; the device can be used for continuously washing, so that the washing efficiency can be improved.