A system and method for separating and collecting cannabis through separates cannabis into plant material, chaff, seeds, and kief; and then collects cannabis byproducts based on size, shape, and weight through separators, including, a screw conveyor, a mechanical vibrator, an ultrasonic mechanism, and a series of stacked classifiers. The method includes: loading unprocessed cannabis into an intake chamber; grinding the cannabis to reduce the size of plant material; carrying the cannabis upwardly through an inclined tube; delivering the cannabis to an elevated terminus at the upper end of the tube; passing the cannabis through stacked classifiers; shaking the cannabis to dislodge oil glands, resin trichomes, and kief from plant material; directing high frequency sound waves towards the cannabis to dislodge oil glands, resin trichomes, and kief from the plant material; and collecting herbaceous plant material, chaff, seeds, oil glands, and kief residue in separate containers.