A kind of greenhouse fast cooling structure includes a room body mechanism and at least one fan. The room body mechanism include a side wall element, one at least one ceiling group ceiling unit and one defined jointly as the side wall element and the ceiling unit made of the interior space. The ceiling group has the ceiling that is obliquely installed of a relative level line and the higher side of the position what ceiling height and the top opening for being connected to the interior space. The fan is installed below the what interior space and the position what ceiling, and can along the ceiling inclined bottom surface blow to form air-flow flow-disturbing, blow out the air of the interior space can by the top opening obliquely. It is obliquely blown out through by air by the top opening, gas circulating flow can be made and drops the temperature of the interior space, to provide preferably plantation environment.一種溫室快速降溫結構，包含一個房體機構，及至少一個風扇。該房體機構包括一個側壁單元、一個具有至少一個頂棚組的頂棚單元，及一個由該側壁單元與該頂棚單元共同界定而成的室內空間。該頂棚組具有一個相對水平線傾斜設置的頂棚，及一個位於該頂棚高度較高的一側且連通該室內空間的頂部開口。該風扇安裝於該室內空間且位於該頂棚下方，並可沿著該頂棚的底面傾斜地吹動形成氣流擾流，使該室內空間的空氣可由該頂部開口傾斜地吹出。透過將空氣由該頂部開口傾斜地吹出，可使氣體循環流動並降該室內空間的溫度，以提供較佳的栽種環境。
