Two-stroke engine capable of scavenging in air pilot mode

The invention discloses a two-stroke engine capable of scavenging in an air pilot mode, which is characterized in that a cylinder is symmetrically provided with a closed-structure scavenging duct; the structure is realized by symmetrically arranging side covers on two sides of the cylinder; one side of the scavenging duct of the cylinder is connected with an air storage cavity; one check valve combination is positioned between the air storage cavity and an admission pipe; a carburettor and the admission pipe are respectively provided with two relatively-independent inlet paths; a case is provided with a case scavenging duct; the case scavenging duct causes a crank chamber to be communicated with a cylinder scavenging duct by the main bearing ball gap of a crank case; flammable mixed gas in the crank chamber is fully mixed when passing through a bearing hole ball which rotates at high speed and is burnt more fully; and fresh air in the air storage chamber is pressed into the cylinder by ...