a hopper where a plant object for seed separation is introduced;

a crushing separator disposed below the hopper, configured to crush the plant object being introduced from the hopper and physically separate the seeds from the plant object;

a cyclone part configured to receive the seeds and non-seed plant objects, which are crushed and separated in the crushing separator, such that by cyclone flow, the seeds sink and lighter-weighted non-seed plant objects float therein, thereby initiating separation of the seeds from the non-seed plant objects; and

a strainer filter part that is mounted to a lower end of the cyclone part and configured to pass the seeds through a strainer filter, thereby spatially separating the seeds from the non-seed plant objects,

wherein the strainer filter part is detachably mounted to the lower end of the cyclone part, such that a pore size of the strainer filter is adjustable.