The invention discloses an automatic table tennis net retracting device which comprises an upper end cover, a spring, a three-groove connecting piece, a shaft sleeve, a connecting sleeve, a slotted sleeve, an inner hollow shaft and a lower end cover, wherein the three-groove connecting piece is sleeved with the shaft sleeve and an inner hole of the connecting sleeve, one end of the connecting sleeve is connected with the upper end cover through threads, the other end of the connecting sleeve is connected with the slotted sleeve through threads, one end of the spring is fixed on a protrusion of the upper end cover, the other end of the spring is fixed on a protrusion of the three-groove connecting piece, one end of the inner hollow shaft is connected with the three-groove connecting piece through three grooves, the other end of the inner hollow shaft is arranged on a hollow protrusion of the lower end cover in a sleeved mode, the net penetrates through one end of a slot of the slotted groove to be fixed on the inner hollow shaft, and the other end of the net is fixed on a hollow shaft outside the device. The device can ensure that the net is tensioned, net retracting can be conducted quickly and conveniently, and net storage is facilitated.