The utility model relates to a preparation device for enhanced microporous filtering membrane, which is characterized in that the device comprises a shell, three non-woven fabric guide pulleys arranged in the shell, a membrane liquid funnel arranged below the second non-woven fabric guide pulley, two knifing roll shafts relatively arranged below the membrane liquid funnel in the radial direction, a gel bath arranged below the knifing roll shaft, two steering roll shafts respectively arranged at the bottom of the gel bath, a driving roll shaft arranged at the right side of the third guide pulley, and a driven roll shaft arranged below the left side of the third guide pulley; casting solution is stored in the membrane liquid funnel, and the gel is stored in the gel bath;the three guide pulleys, two knifing roll shafts and two ends of the driving and driven roll shafts are respectively supported on the shell by bearings. The preparation device has small size, adjustable knifing thickness and can perform continuous operation or discontinuous operation according to the requirement of the experiment, thus not only being suitable for being used in labs, but also being suitable for small-scale industrialized continuous production.