To provide a warp-sizing apparatus with which a large amount of warps can well be sized and finished without exchanging a sizing liquid.

This warp-sizing apparatus is characterized by comprising a plurality of independent sizing tanks through which warps are sequentially passed to size the warps, a supplying means for supplying a sizing liquid in the sizing tank placed on the downstream side in the warp transfer direction to the adjacent upstream side sizing tank, and a replenishing means for replenishing a replenish sizing liquid to the sizing tank placed on the most downstream side.