TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The step of neutralizing the ice solution of titanium salt with alkali to prepare a new precipitate metatitanic acid comprises dissolving titanium chloride or titanium sulfate in ice water, neutralizing the mixture with 10-30% of sodium hydroxide, controlling the pH of 7-8, precipitating the mixture in the ice water above 5 degrees C to separate out the milky gelatinous metatitanic acid, cleaning the new precipitate metatitanic acid with distilled water for removing the chlorine or sulfur ion, partially dehydrating the new precipitate metatitanic acid after removing the chlorine or sulfur ion, then instantly using the obtained product for acid-soluble chelating. The microwave hot-melting and chelating process comprises preparing a citric acid-metatitanic acid suspension mixture by adding the citric acid with metatitanic acid, where the molar ratio of titanium to citric acid 1:2.5-4, dissolving crystalline citric acid monohydrate in the absorbed water of the new precipitate metatitanic acid, stirring the mixture uniformly to generate the milky citric acid metatitanic acid suspension mixture, synthesizing the citrate titanium by the microwave hot-melting and chelating process by placing the citric acidmetatitanic acid suspension mixture in a specific plate type polytetrafluoroethylene resin reactor, performing radiation hot-melting and chelating treatment by a cabinet microwave device or a tunnel microwave device having a work frequency of 915 MHz, or 2450 MHz and a microwave power of 1-10 KW, controlling the microwave hotmelting temperature of 100-120 degrees C, ending the reaction when the milky suspension mixture becomes colorless and transparent glue, and preparing the saturated solution of titanium citrate by diluting the titanium citrate glue prepared by the microwave hot-melting and chelating process with distilled water into the saturated solution of titanium citrate while the glue is still in the hot-melting state. The step of neutralizing and salting out the saturated solution of titanium citrate with ammonium carbonate powder comprises preparing an acidic titanium citrate-ammonium citrate composite salt regulating the pH of the saturated solution of titanium citrate to 1.5-2.5 with ammonium carbonate or ammonium hydroxide solution, crystallizing and separating out the titanium citrate and organic ammonium salt, ageing the crystals at a room temperature of not less than 25 degrees C for 24 hours, then removing the absorbed water at the surface with hot air at 60 degrees C so as to obtain the semi-dry acidic titanium citrate ammonium citrate composite salt. The step of matching the titanium citrate-ammonium citrate composite salt with ammonium fulvate salt and performing hot-melting and chelating treatment in the microwave to prepare an organic titanium-ammonium fulvate composite salt comprises matching the titanium citrate-ammonium citrate composite salt with ammonium fulvate salt of 1.0:0.3-1.0, preparing the titanium citrate-ammonium citrate into water solution, then spraying the solution on the ammonium fulvate to be mixed uniformly, and placing the ammonium fulvate sprayed with the titanium citrate-ammonium citrate solution in the specific plate type polytetrafluoroethylene resin reactor, performing radiation hot-melting and chelating treatment by the cabinet microwave device or the tunnel microwave device having a work frequency of 915 MHz or 2450 MHz and a microwave power of 1-10 KW, controlling the microwave hotmelting temperature at 100-120 degrees C, and obtaining the titanium citrate-ammonium citrate composite salt by performing the microwave radiation hot-melting and chelating treatment. The step of mixing urea with the organic titanium-ammonium fulvate composite salt and preparing the organic titaniumfulvic acid urea by the microwave hotmelting process comprises spraying a little water to the urea and the organic titanium ammonium fulvate composite salt a ratio of 8-9:1-2, mixing uniformly, placing the mixture in the specific plate type polytetrafluoroethylene resin reactor, performing radiation hot-melting and chelating treatment by the cabinet microwave device or the tunnel microwave device having a work frequency of 915 MHz or 2450 MHz and a microwave power of 1-10 KW, controlling the microwave hotmelting temperature of 100-120 degrees C, and obtaining the titanium containing fulvic acid urea compound fertilizer by performing the microwave hot-melting and chelating treatment. Preferred Components: The new precipitate metatitanic acid is matched with citric acid, and molar ratio of 1:2.5-4.