The invention relates to the technical field of infant testing, and discloses a device for testing infants' tennis distance throw. The device comprises a distance throw sensor board 2, a sensor blanket 3 and a sensor tennis 5, the connection portion of the distance throw sensor board 2 and the sensor blanket is provided with a lag line 1, the sensor blanket 3 is a rectangular bar-shaped sensor blanket, and the two rectangular edges are provided with scales; the distance throw sensor board 2 and the sensor blanket 3 are respectively connected with a distance measurement display device 4 throughcables. The device for testing infants' tennis distance throw can intelligently test the infants' tennis distance throw, the structure is simple, the accuracy is high, and the labor intensity of a tester can be reduced, the device makes the infants have the fun to play, and the distance of the tennis distance throw is prompted through voice.