The invention discloses a motor connecting structure for a gas-electric hybrid engine. The motor connecting structure comprises a motor assembly, wherein a transmission disc is arranged on an output shaft of the motor assembly in a sleeving manner; a connecting shaft hole is axially formed in the middle part of the transmission disc, and is provided with a first connecting section and a second connecting section, the first connecting section is used for connecting a transmission shaft of an internal combustion engine, and the second connecting section is used for connecting the output shaft of the motor assembly; two one-way overrunning clutches are arranged opposite to each other in the second connecting section in an interference pressing manner, and have opposite overrunning directions. With adoption of the structure, two groups of output power of the internal combustion engine and a motor are effectively combined, and a starting motor, a charging magneto and a driving motor are integrated, so that repeated design and use of related parts is greatly reduced, the occurrence rate of a failure is reduced, the structural cost of the gas-electric hybrid engine is greatly reduced, and the gas-electric hybrid engine is convenient to mount, easy to maintain and high in reliability.