The invention discloses a robot table tennis ball serving device and belongs to the technical field of robots. A first cylinder, a second cylinder and a third cylinder are mounted on a bottom plate, a support plate is mounted on the first cylinder, the second cylinder and the third cylinder, a moving assembly is mounted on the support plate, a ball clamping assembly is mounted on the moving assembly, a ball serving support rod is mounted on the support rod, a ball serving cylinder is mounted on the ball serving support rod, a ball serving rod is mounted on the ball serving cylinder, a ball containing assembly is mounted on the support plate, a spring and a spring guide rod are mounted on the support plate, and a ball serving limitation block is mounted on the spring and the spring guide rod. The robot table tennis ball serving device has the beneficial effects as follows: the device is simple, reasonable and novel in structure, simple and convenient to operate, low in cost, good in training effect and high in practicability and can overcome defects in the background art and maintains advantages of the background art.