The invention discloses a wheeled liquid storage barrel for a liquid spraying device. When a liquid storage barrel of a traditional spraying device moves for work, many defects exist. The wheeled liquid storage barrel comprises a liquid storage cavity. The ratio of the width of the wheeled liquid storage barrel to the diameter of the wheeled liquid storage barrel is 1:0.5-6. A hollow shaft is assembled through joint cooperation of a left bearing and a right bearing fixed to a left bearing block and a right bearing block, and the wheeled liquid storage barrel can rotate around the hollow shaft. A partition plug is arranged in the middle of the hollow shaft. The hollow shaft is provided with an air inlet hole communicated with a barrel inner cavity. A one-way air inlet valve is assembled at the right end of the hollow shaft. The part, at the left end of the partition plug, of the hollow shaft is communicated with a liquid suction pipe through thread fastening, and the hollow shaft is arranged to be perpendicular to the liquid suction pipe. A liquid injection hole is formed in the outer edge of the wall of the wheeled liquid storage barrel. A bearing frame, a wheel and the liquid storage barrel are combined into one, liquid storage and wheel performing can be achieved, the wheeled liquid storage barrel can roll and run on the ground through a traction frame and traction power, and the wheeled liquid storage barrel is suitable for all spraying devices.