A drawing machine has a base, a barrel, a cover, a blower, a ball selector, two curved tubes, a ball collector and two connector assemblies. The barrel is transparent to contain balls and has an access window. The cover is attached to the barrel to close the window. The blower is connected to the barrel to blow air into the barrel. The ball selector extends into the barrel to gather individually the balls. Two curved tubes are mounted in the base and are connected to the ball selector. The connector assemblies are connected respectively to the bottoms of the curved tubes. Each connector assembly has a motor and a connector. The connector is driven by the motor and has a passage and a guiding channel. The passage selectively communicates with one of the curved tubes. The guiding channel selectively corresponds to the ball collector.