A pipe end cutting device of long large-diameter pipe fittings comprises a fixing pipe fitting supporting base, two rails, two pipe fitting supporting locating vehicles, two movable material receiving vehicles and two pipe end intersecting line cutting machines, wherein the two rails are arranged on two sides of the fixing pipe fitting supporting base, and the two pipe fitting supporting locating vehicles are arranged on the two rails oppositely and sequentially arranged from one end to the other end of the side where the fixing pipe fitting supporting base is located; all the two movable material receiving vehicles, the pipe fitting supporting locating vehicles and the two pipe end intersecting line cutting machines can move on the rails to achieve position adjustment, meanwhile, the two pipe fitting supporting locating vehicles have the multi-direction moving regulation function, and therefore the whole equipment can complete intersecting line cutting work of pipes with different lengths and different pipe diameters.