The utility model relates to a polymerization still, in particular to a batch type liquidoid noumenon polypropylene polymerization still, which is characterized in that: an agitator adopts double ribbons in the upper part and four pitched blade scrapers at the bottom part; a shaft seal adopts a combination of a stuffing seal and a labyrinth seal, and a head-punching-bottom stuffing device is added at the bottom part; a jacket adopts a combined structure of a flow guide plate with double helix and radiating fins; an inner cooling pipe adopts an allotype calandria structure; the top of an end enclosure is provided with a gas phase condensing reflux system; the volume of the autoclave body ranges from 16m3 to 50m3. The utility model solves the problem of too large size of the prior polymerization still and lack of heat retrieving ability, strengthens the hydrogen regulation effect, and improves both the single-batch output and the quality of the products.