The invention relates to a preparation method of a paraffin section; in a process of preparation of the section, provided are a high-efficiency environmentally-friendly dehydration transparent agent and dewaxing agent; compared with conventional common xylene, the dehydration transparent agent is safer and more environmentally friendly, also can simplify experimental steps, and makes dehydration and transparency completed in one step operation. For further improving the efficiency of the operation, according to the dehydration transparent agent and dewaxing agent, dehydration transparency anddyeing dewaxing operating conditions are optimized, the temperatures of all steps are strictly controlled, and the reaction is controlled to be carried out under a condition of negative pressure, so as to optimize the dyeing dewaxing operating steps. Through the operation, the time of the experiment can be greatly shortened, and a quite clear organizational structure chart can be obtained finally.