1. A system for high precision imaging for three-dimensional topography of cracks in a rock hydraulic fracturing test, comprising: a high precision rotary hydraulic fracturing testing machine for rocks and a laboratorial x-ray industrial CT, wherein said high precision rotary hydraulic fracturing testing machine for rocks includes a frame, a support device, a rotation device, a peripheral pressurizing device and an axial pressurizing device at least partially disposed within the frame as well as a high pressure water pump at least partially disposed outside the frame, wherein the support device is used for clamping a rock sample from upper and lower sides of the rock sample, the rotation device is connected with the support device and used for rotating the rock sample, the peripheral pressurizing device is disposed to surround the rock sample and used for applying pressure on periphery of the rock sample, the axial pressurizing device is provided below the rotation device and used for applying axial pressure to the rock sample, the high pressure water pump is used for supplying fracturing fluid into the rock sample to form fractured cracks within the rock sample, wherein the laboratorial x-ray industrial CT is used for forming a CT image of the fractured cracks in the rock sample, wherein the fracturing fluid is solution containing fluorine nuclides, and the system further comprises a high resolution planar array SiPM detector for nuclides which is used for receiving optical signals emitted by fluorine nuclides in the fractured cracks and then converting the optical signals into electrical signals for imaging.