The invention provides a simulation method and device of an artificial fracture. The method comprises the following steps: performing data classification and time-space path analysis on obtained microseism events, constructing a fracture propagation path network; constructing a fracture density body and a fracture distribution range according to the fracture propagation path network; determining afracture combination type and geometrical parameters according to a stress state type and a fracture criterion; performing stochastic simulation by using the fracture density body and the fracture distribution range as constrains in combination with the stress state type and the fracture criterion to generate an artificial fracture discrete fracture network; and generating an artificial fractureattribute parameter field in combination with the obtained hydrofracture construction data and reservoir development dynamic data. According to the simulation method and device provided by the invention, on the basis of microseism monitoring data, and in combination with the regional geological information, fracture construction information and reservoir development dynamics and other data, a fracture discrete fracture network model meeting the fracture construction information and an artificial fracture expansion mechanism is established, and the anisotropism and complexity of a hydrofracturefracture network can be characterized.