The invention discloses a manual fast dewatering machine. The dewatering machine comprises a box body, a driving assembly and a resetting assembly. The top of the box body is open, a water outlet holeis formed in the side wall of the box body, the water outlet hole is connected with a draining pipe, and a base plate is horizontally arranged at the bottom of the interior of the box body. A cylindrical dewatering cylinder is arranged in the box body, the bottom end of the dewatering cylinder penetrates through a through hole in the base plate, the middle of the bottom surface of the dewateringcylinder is connected with a longitudinally disposed rotating shaft, a driven gear is mounted on the rotating shaft, and the driven gear meshes with a bevel gear. The driving assembly includes a mounting plate, a tooth plate, a rotating rod, a second connecting rod and a second push rod. The mounting plate is horizontally disposed under the dewatering cylinder, the bottom surface of the mounting plate is connected with the inner bottom surface of the box body through a plurality of telescopic rods, the bottom surface of the mounting plate is provided with springs, the tooth plate is slidinglydisposed on the top surface of the mounting plate, and a rack on the tooth plate is meshed with the bottom end of the bevel gear. The machine is simple in structure, convenient to use and great in dewatering effect.