The invention discloses a virtual operation simulation training system for preoperative training and a training method thereof. The system comprises a main node and multiple sub nodes in synchronous communication connection with the main node. Each of the main node and the sub nodes comprises a haptic interaction device, a soft tissue cutting simulation module and a realistic real-time rendering module. Through an operation process for a virtual operation trained on the main node recorded by the main haptic interaction device, the main soft tissue cutting simulation module and the main realistic real-time rendering module, the operation of a physician is mapped to each sub node in a real time mode, and the trained physician can sense the operation process via the sub haptic interaction device on the sub node. A model differential encoding algorithm is adopted, and each sub node can quickly obtain a three-dimensional operation model. A high-difficulty operation can be prevented from being trained on a patient, a learning curve and a training cost of the trained physician are shortened, and popularization and improvement of the soft tissue cutting operation technology are promoted.