A fracturing effect determination method for phase transition fracturing deep rock, comprising: obtaining initial data of a true triaxial rock of a fracture hole; fracturing true triaxial rock and obtaining acoustic emission information in the fracturing process; obtaining test data of the true triaxial rock after fracturing; inputting initial data and test data into a preset formula to generate test data; determining quantitative data of fracturing according to acoustic emission information and test data and determining the fracturing effect of true triaxial rock according to the quantitative data of fracturing. The method is implemented using a device comprising a carbon dioxide fracturing device, a true triaxial loading device, a fracturing starter, a storage tank, and a liquid filling device. The device is configured to achieve the quantitative optimization effect of the technical parameters required for the prevention and control measures of energy release in deep engineering rock mass