The invention discloses a two-stroke liquefied petroleum gas (LPG) engine provided with a buffer scavenging pressure reduction film combining coarse filtration with fine filtration based on auxiliary analysis. The LPG engine is used for driving garden machines. A gas fuel tank is filled with LPG and comprises a micro propane fuel tank body. The front portion of the micro propane fuel tank body (t20) is provided with a pipe thread. Fuel enters the engine from a pipe joint through a gas mixing controller for working. The front portion of the micro propane fuel tank body is further provided with a safety valve, so that the fuel is prevented from overflowing when exceeding the limit value, and thus the safety effect is achieved. The rear portion of the micro propane fuel tank body is provided with a tank bottom base plate (t20c), and a plurality of base holes (t20d) which are uniformly distributed are formed in the tank bottom base plate (t20c), so that the micro propane fuel tank body is convenient to carry. The tank diameter of the micro propane fuel tank body is smaller than 100 millimeters, and the micro propane fuel tank body is filled with 465 grams of propane fuel so that the micro propane fuel tank body can be replaced conveniently according to the standard. A filter screen in a scavenging channel of the micro propane fuel tank body is a 40-mesh coarse filter screen. A 140-mesh fine filter screen and a scavenging port buffer valve are further arranged below the scavenging channel. A cutter is provided with a plurality of saw teeth. The quality of the garden machines is improved by continuously improving the two-stroke LPG engine 1E33F.