The utility model belongs to toys for children, in particular relates to a pneumatic toy boat. The technical scheme of the pneumatic toy boat is as follows: the pneumatic toy boat comprises a boat body which is pushed by the gas injection adopted by a power plant; a sleeve is arranged on the top of the tail of the boat body; and a slim tube is arranged at the tail end of the boat body; the slim tube is communicated with the sleeve with the upper end sleeved with balloons. The outer wall of the upper end of the sleeve is provided with a groove ring in which the rubber band at the opening of the balloon is exactly buckled; and the port of the slim tube is arranged in a slightly downward sloping way. The pneumatic toy boat has the advantages of that balloons are adopted as the power of the toy boat, neither batteries nor fuels are needed, no potential safety hazard exists, and the use cost is low, the structure of the product is simple, the firmness is good, and the production cost is low. The pneumatic toy boat can not be damaged or demolished by children in use; besides, the toy boat is driven by balloons to move, so children can know intuitively that air injection can drive boat to move, thereby the utility model plays the role of teaching through lively activities.