The invention discloses a loader, and relates to the technical field of loaders. The loader comprises a lifting platform and a loading assembly, the loading assembly comprises a T-shaped support, an overturning assembly and a clamping assembly, and the clamping assembly comprises a loading barrel; sliding grooves are formed in the top and the bottom of the loading barrel, annular fluted discs are slidably connected to the bottoms in the sliding grooves, and a plurality of screws annularly penetrate through the loading barrel at equal intervals; a clamping plate is fixed to the end, located in the loading barrel, of the screw, a first gear meshed with the annular fluted disc is in threaded connection with the outer circle face of the end, located in the sliding groove, of the screw, and a gear ring is fixed to the outer circle face of the annular fluted disc. According to the present invention, a second gear is driven by the driving assembly to rotate, so that the screws on the loading barrel synchronously and horizontally move, the clamping plates are driven to synchronously move towards the outer wall of a barreled water barrel, the clamping force of the clamping plates on the outer wall of the barreled water barrel is evenly distributed, the barreled water barrel is well clamped, and the situation that the barreled water barrel is damaged, is effectively avoided.