NOVELTY - The system comprises a gas-phase catalytic decomposition reactor for decomposing raw materials including hydrocarbons, wood-based biomass, algae and micro-algae, a stirrer for stirring the raw materials with a catalyst for decomposing raw material into water vapor, oil, water-soluble substance and a sludge, a condenser for condensing the gaseous oil, a heat exchanger for collecting heat of the gaseous oil from the catalytic decomposition reactor, and an oil water separator located in a lower part of the reservoir for separating condensed oil with water.    USE - The system is useful for generating oil from biomass such as rice straw, wheat straw, corn straw, cane stem, Giant Cane stem, wood composite, hydrocarbon, coconut trees or palm, canola, Jatropha, and microalgae.    ADVANTAGE - The system can be used to obtain high-quality oil from the biomass without generation of greenhouse gases and carbon dioxide generation.    DETAILED DESCRIPTION - The system comprises a gas-phase catalytic decomposition reactor for decomposing raw materials including hydrocarbons, wood-based biomass, algae and micro-algae, a stirrer for stirring the raw materials with a catalyst for decomposing raw material into water vapor, oil, water-soluble substance and a sludge, a condenser for condensing the gaseous oil, a heat exchanger for collecting heat of the gaseous oil from the catalytic decomposition reactor, a reservoir storing the condensed oil from the condenser, an oil water separator located in a lower part of the reservoir for separating condensed oil with water, a steam boiler located in the reservoir for heating the oil to a boiling point, a distillation tower including a first gas outlet port, a second gas outlet port and a third gas outlet port, a sludge incinerator connected to the catalytic decomposition reactor through a lower valve, a heating section connected with the catalytic decomposition reactor through a liquid pump, multiple heat exchangers that are connected with the catalytic decomposition reactor, a heat source providing electric energy to the catalytic decomposition reactor, and a catalyst recovery unit connected with the catalytic decomposition reactor for supplying the catalyst. A vacuum pump is used for smoothly pulling out gaseous substances generated in the catalytic decomposition reactor. A catalytic reformer is used for reforming the gaseous substances generated in the catalytic decomposition reactor into gasoline, diesel and the heavy oil. The system further includes a pulverizing device for pulverizing the raw materials into pieces and is connected with a front portion of the catalytic decomposition reactor. An extruder is used fro heating the raw materials at 120-450 degrees C. A heating evaporation part evaporates a water-soluble material from the oil water separator and residual chemicals. A collection basin is equipped in the lower part of the oil water separator for collecting the residual chemicals. The stirrer is maintained with a speed of 60-10000 revolutions per minute. The reactor decomposes the crude raw materials into sulfur and unconverted oil at 350 degrees C. The catalyst reformer is maintained with a space velocity of 3000-100000 units/hour.