The utility model discloses a feet and stand connecting device of a trampoline, which comprises trampoline frames, leg frames, bolts, etc. The trampoline frame is provided with through holes of proper quantity for the bolts, and the upper end of the leg frame is provided with a corresponding screw for screwing with a nut, wherein, the cross section of the upper end of the through hole of the trampoline frame is noncircular, and a figure of the upper section of the bolt corresponds to the cross section on the upper end of the through hole. The bolt is limited and can not be rotated when the bolt passes through the through hole positioned on the trampoline frame, and the leg frame is used for the spiral connection. Users can dismantle or combine the trampoline by himself without hand tools. The utility model has the advantages of convenient operation and space saving.