The embodiment of the invention relates to a method and a device for drawing a mind map on line, and the method comprises the steps: displaying a central node in a webpage for drawing the mind map; detecting a node generation operation input by a user; determining a node type corresponding to the node generation operation; and generating a node corresponding to the node type in the webpage based on the node type to obtain a mind map comprising the central node and the generated node. According to the embodiment of the invention, the mind map is drawn in the webpage without an installation tool, and the drawn mind map can be stored in the server through the network, so that the consumption of local software and hardware resources is reduced. Besides, by enabling the node generation operation to correspond to the node type, the user only needs to input the node generation operation to automatically generate the corresponding node, the operation complexity of the user is reduced, and theuser experience is improved.