The present invention relates to a variable-volume type tent fumigation booth used in a fruit fumigation facility. The variable-volume type tent fumigation booth varies the volume of the fumigation booth during a fumigation operation to enhance the fumigation efficiency, maximizes the storage capacity of the fumigation gas, and enables the fumigation gas to be easily diffused into a fruit box. Accordingly, the fruit fumigation facility includes: a tent type fumigation booth (170) arranged in the facility (100)； a chemical tank (10) storing a fruit fumigation agent； a vaporizer (30) heating the chemical liquid to vaporize the liquid thereof； a fumigation gas supply line (50) supplying the fumigation gas into the tent type fumigation booth (170)； an air supply line (90-1) supplying air into the fumigation booth (170)； and an exhaust line (110-1) discharging the fumigation gas after the fumigation operation is completed. The tent-type fumigation booth (170) includes: multiple lower vertical members (350) installed in the vertical position； a tent (500) which is arranged to surround the periphery of the lower vertical members (350)； a lifting member (320) which is arranged on the upper part of the tent (500) to be lifted up and down； an upper vertical member (310) connected to the lifting member (320)； a horizontal member (300) which is arranged on the upper part of the horizontal vertical member (310)； an elastic member (330) connecting the horizontal member (300) and the lifting member (320)； and a pit (400) formed at the bottom of the facility (100).본 발명은 과일 훈증소독 시설의 체적 가변형 천막식 훈증부스에 관한 것으로서, 훈증소독시 훈증부스의 체적이 가변되도록 함으로써 훈증소독의 효율성을 증대시키고, 훈증가스의 보유량을 최대한 증대시키며, 훈증가스가 과일 상자 내부로 용이하게 확산되도록 하는데 그 목적이 있다. 이를 위하여 본 발명은, 시설물(100)의 내부에 구비되는 천막식 훈증부스(170)와, 과일 소독용 훈증제를 내장한 약액 탱크(10)와, 액상의 약액을 가열하여 기화시키는 기화기(30)와, 훈증가스를 천막식 훈증부스(Booth)(170)의 내부로 공급하는 훈증가스 공급라인(50)과, 훈증부스(170)의 내부로 공기를 공급하는 공기 공급라인(90-1)과, 훈증소독이 완료된 후 훈증가스를 배출하는 배기라인(110-1)을 포함하여 이루어지는 과일 훈증소독 시설에 있어서, 상기 천막식 훈
