NOVELTY - A one-step air catalytic oxidation synthesis of pyridine formic acid compound is processed by mixing methyl pyridine-type-compound, water vapor, and air or oxygen-enriched air, vaporizing, preheating to 230-300 degrees C, feeding preheated mixed material gas in fixed bed reactor filled with vanadium oxide/titanium oxide (V2O5/TiO2) catalyst, reacting, feeding reaction gas product to condensing sublimation device, cooling, subliming to obtain crystal at bottom of discharge, collecting solid-liquid mixture, separating solid product A, and recrystallizing solid product A.    USE - One-step air catalytic oxidation synthesis of pyridine formic acid compound (claimed).    ADVANTAGE - The process has low cost and raw material loss, high raw material conversion rate and product purity, and mild reaction condition, avoids using strong oxidant, makes full use of a material, increases yield, reduces energy consumption and pollution discharge, and is convenient.    DETAILED DESCRIPTION - A one-step air catalytic oxidation synthesis of pyridine formic acid compound is processed by mixing methyl pyridine-type-compound, water vapor, and air or oxygen-enriched air in which ratio methyl pyridine-type compound:water vapor:air or oxygen-enriching air is 1:20-120:40-180, vaporizing, preheating to 230-300 degrees C, feeding preheated mixed material gas in fixed bed reactor filled with V2O5/TiO2 catalyst, reacting at 230-300 degrees C in which methyl pyridine-type compound reaction medium amount space velocity is 0.01-1/hour, feeding reaction gas product from reactor discharge to condensing sublimation device, cooling, subliming to obtain crystal at bottom of discharge, collecting solid-liquid mixture, separating solid product A, and recrystallizing solid product A in which methyl pyridine-type compound is 2-methyl pyridine, 3-methyl pyridine, or 4-methyl pyridine, and pyridine formic acid is 2-picolinic acid, nicotinic acid, or isonicotinic acid. An INDEPENDENT CLAIM is included for special device for one-step air catalytic oxidation synthesis of pyridine formic acid compound comprising raw material storage tank, raw material preheater, fixed bed reactor filled with V2O5/TiO2 catalyst, condensing sublimation device, cyclone separator, circulation compressor in which raw material storage tank is connected to raw material preheater inlet through raw material metering pump, raw material preheater top outlet is connected to fixed bed reactor top end gas inlet, fixed bed reactor gas outlet set at bottom is connected to condensing sublimation device upper end gas inlet, condensing sublimation device is set with 1st collecting sublimation product outlet at bottom, air inlet and water vapor inlet on top, and gas outlet at lower side wall, cyclone separator upper end inlet is connected to gas outlet, cyclone separator is set with 2nd collecting product outlet at bottom and tail gas outlet on top, tail gas outlet is connected to circulation compressor inlet, and circulation compressor outlet is connected to preheater at bottom inlet.