Tennis ball service device

The invention provides a tennis ball service device which comprises three foldable supporting mechanisms, a walking disc, a center supporting rod, a height and direction rotation mechanism, a ball box, an air compressor, a seat and the like. The tennis ball service device is separated from a service angle adjusting device and can guarantee ball service speed, ball service direction and placement which can be selected and set according to needs. A series of actions are automatically completed. In a specific embodiment, the center supporting rod and the ball box are main supporting parts, height and direction rotation angles are obtained by driving the mechanisms by a double-output motor. The power source of tennis ball service is the air compressor. The tennis ball service device is simple in structure, an existing complex mechanism is changed, the defects that a traditional machine is high in fault rate and instable in ball service quality are avoided, a tennis ball channel cannot abrade tennis balls, and the service life of the tennis balls is prolonged.