The invention discloses a separation and purification device for edible oil pre-processing. The device includes an oil intake funnel coarse filtration sieve, a fine filtration sieve and an evaporation tank. The bottom of the oil intake funnel is fixedly connected to a sieving pipe, a coarse impurity discharge port is fixedly arranged on one side of the sieving pipe inner wall, the outside of the coarse impurity discharge out is in threaded connection with a coarse impurity cover, the coarse filtration sieve is fixedly connected to the bottom of the coarse impurity discharge port and the sieving pipe inner wall, a fine impurity discharge port is fixedly arranged on the sieving pipe inner wall at the bottom of the coarse filtration sieve, and the outside of the fine impurity discharge out is in threaded connection with a fine impurity cover. According to the invention, fixed plates are fixedly connected to the evaporation tank, and low temperature electric heating tubes are fixedly mounted on the fixed plates for heating and baking of product oil, as the boiling point of edible oil is far higher than water, water in edible oil can be evaporated by means of appropriate temperature, and edible oil is not affected, so that the evaporated edible oil can be stored for a longer time.