The invention provides a catalyst for preparing methylal and methyl formate through one-step selective oxidation of methanol. The catalyst comprises the following raw material components in percentage by mass based on total mass of the raw material components of the catalyst: 10-20% of a vanadium source, 55-65% of a titanium source and 15-35% of sulfuric acid. The invention provides a catalyst for preparing methyl formate and methylal through one-step selective oxidation of methanol and a preparation method of the catalyst. The catalyst has a high methanol conversion rate, high product selectivity, long life and low-temperature fluctuation sensitivity, the product composition is easily controlled in industrial reaction, and subsequent separation is convenient.