The invention discloses a device for manufacturing a hollow filter stick with a special shape. A certain distance is spaced between a forming machine and an opener; a steam hardening device is mounted within the section of the distance and comprises a group of high pressure air nozzles, a forming tongue, a cloth band mechanism used for clamping a tow band to move forward, a cigarette gun passage and a steam generator, wherein the cloth band mechanism is connected with a host driving device; the high pressure air nozzles are connected with the opener and used for receiving the tow band conveyed by the opener while output ends of the high pressure air nozzles are communicated with the forming tongue; the tow band is conveyed into the forming tongue; and a strip-shaped hollow mould is fixed on the front end of the forming tongue. The invention has the advantage that a better hardening promoting effect can be obtained because the steam hardening device and a plasticizer heating device (the steam generator) are added. Moreover, in the product, the curing time of the filter stick is largely shortened by using modified glyceride.