The invention discloses a multifunctional outdoor portable device for separating soil meso- and micro-faunae. The multifunctional outdoor portable device comprises a dimming switch, a lamp holder, a bulb and a lampshade. The bulb is mounted on the lamp holder which is clamped in the center of the lampshade, the dimming switch is mounted on a circuit board connected with the lamp holder, and supporting frames are arranged below the lampshade and fixedly connected to four corners of a filter screen through screws. A fence is fixed through clamping grooves around the outer side of the filter screen, partition plates are arranged in the center of the fence, the filter screen is provided with T nuts, and collection bottles are put below collection funnels. The multifunctional outdoor portable device is simple in structure, convenient and practical, luminance and temperature of the bulb can be controlled through regulation of the dimming switch to adapt to separation of samples different inmoisture content and thickness, positions of the transverse and longitudinal partition plates can be adjusted to adapt to samples different in quantity, and quantitative sample separation can be performed by changing quantity of the transverse and longitudinal partition plates.