The invention relates to a two-stroke gasoline engine cylinder. The cylinder comprises a cylinder body, a first side cover and a second side cover, wherein after the first side cover is matched with the cylinder body, one pure air storing chamber is formed; after the second side cover is matched with the cylinder body, another pure air storing chamber is formed; the cylinder body is provided witha pure air inlet, a mixer gas inlet, a scavenging port and an exhausting port; the installing flange positions, close to scavenging channels on the two sides, of the cylinder body are provided with aplurality of scavenging flow limiting holes; the structure of the scavenging flow limiting holes can limit the scavenging charge and increase the scavenging speed for mixed gas participating in scavenging, so that the mixed gas fast passes through the scavenging flow limiting holes to fast eject pure air in the pure air storing chambers into a combustion chamber, the charge of fresh gas in tail gas is faster occupied, and due to the fact that the tail gas exhausted out of the exhausting port of the cylinder body contains lots of fresh pure air, the content of THC and CO in the tail gas can begreatly lowered, and the purpose of energy saving and emission reducing is achieved.