The invention discloses a generation system of a tree type network topological graph and a generation method of the tree type network topological graph. A network system is formed by communicating a plurality of sets of network equipment with a network host, and a topological information graph of root network equipment is obtained by the network host; a plurality of sets of first type network equipment taking the root network equipment as father nodes are searched; a plurality of sets of nth type network equipment taking corresponding (n-1)th network equipment as father nodes are obtained by a topological collection protocol; and finally, attribute parameters of each set of network equipment are set to form the tree type topological graph of a network system in the network host. According to the generation system and the generation method, the tree type topological graph has clear and simple logic and is easy to realize; and when a network system has a fault, a network manager can rapidly position the network fault and the maintenance efficiency is greatly improved.