The invention discloses an emitter with controllable ejecting channel tracks. The emitter comprises a ball conveying device, an emitting device, an angle-adjustable pitch assembly and a pipe fitting connecting assembly. The ball conveying device comprises a ball cabin and a movable ball falling opening, the ball cabin comprises a funnel-shaped frame and a plurality of ball storage channels, the ball storage channels are obliquely parallelly arranged in the frame, and an infrared emitting head is arranged at the high end of each ball storage channel; the movable ball falling opening is formed in the frame, is formed in positions at the lowermost ends of the ball storage channels and comprises a linear movable mechanism and a sliding door assembly, the sliding door assembly can reciprocate along the linear movable mechanism, and an infrared receiving head which is matched with the infrared emitting heads is further arranged on the sliding door assembly; the emitting device comprises the angle-adjustable pitch assembly and an emitting assembly, and the emitting assembly is arranged on the pitch assembly; the pipe fitting connecting assembly is arranged between an outlet of the sliding door assembly and an inlet of the emitting assembly in a movably connected manner. The emitter has the advantages that the emitter can be controlled easily and reliably, is light and small and is low in manufacturing cost, emitting ranges and emitting angles are flexible and adjustable, and emitting curves are high in anti-interference performance.