A mechanical clutch of a hose reel sprinkler irrigation machine, comprising: a reducer output shaft (1), an external splined sleeve (3), an internal splined flange (4), a bearing (5), an output flange (6), a retaining ring (9), a lever device (10), and a machine frame (11). The internal splined flange is mounted on the reducer output shaft via the bearing. The bearing achieves axial positioning by means of a shaft shoulder of the reducer output shaft and the retaining ring. The output flange is fixed to the internal splined flange. The output flange comprises a power output member for outputting power to a hose reel. The external splined sleeve is mounted on the reducer output shaft. The lever device is mounted on the machine frame. By means of rotating a handle of the lever device, a lever is made to move the external splined sleeve to the left or right on the reducer output shaft, thereby achieving engagement and disengagement of the clutch. The mechanical clutch of the sprinkler irrigation machine can realize separation of the hose reel and a transmission system during hose rewinding, ensuring a smooth hose rewinding process.
