The present invention relates to a kind of preparation method of rubber vulcanization accelerator bispentamethylene thiuram tetrasulfide, wherein said method uses water as solvent, and the raw materials used and their molar ratio are: hexahydropyridine: carbon disulfide: sulfur: hydrogen peroxide =1: 1~1.3: 1.8~2.5: 0.4~0.7, the specific process of the method is: under normal pressure, add hexahydropyridine and sulfur successively in the reaction kettle filled with water under stirring state, after adding Finally, control the temperature within the range of 20°C to 30°C, then add carbon disulfide liquid dropwise, and control the dropwise addition time for 2 to 3 hours. After the dropwise addition, measure the pH value of the reaction solution. After the temperature is stable within the range, control the temperature of the reaction solution at 30°C to 40°C, and start to add hydrogen peroxide dropwise to carry out the oxidation reaction. The oxidation reaction time is 3 to 4 hours; The liquid is separated, and the obtained solid is dried, crushed, sieved, and packaged to obtain the product. The method of the present invention has short production cycle, high safety factor, almost no waste gas emission, high melting point, good appearance and high yield of the obtained product, which is obviously superior to other preparation methods, and the comprehensive cost is low. Adopting the method of the present invention can improve the product Quality, energy saving and consumption reduction, reducing "three wastes" pollution.