The invention discloses a threshing machine capable of compressing tree leaves. The threshing machine comprises a worktable, wherein a supporting frame is fixedly connected to the right side of the top of the worktable, a supporting table is fixedly connected to the top of the supporting frame, a suction ventilator is fixedly connected to the top of the supporting table, a first connecting pipe is communicated to the right side of the top of the suction ventilator, a suction ventilator cover is communicated to the end, away from the suction ventilator, of the bottom of the first connecting pipe, a second connecting pipe is communicated to the bottom of the left side of the suction ventilator, a protective box is communicated to the left side of the second connecting pipe, and an air cylinder is fixedly connected to the top of the inner cavity of the protective box. The threshing machine can effectively compress tree leaves through matched usage of the air cylinder, a first connecting rod, a supporting rod, a cushion block, a press plate, a fixing block, a roller and a sliding groove, so that a compression effect is better, the problem that the internal storage space of an existing threshing machine is occupied when tree leaves are collected is solved, and the practicability of the threshing machine is improved.