The invention discloses an all-wheel same-phase driving trolley and a turning control method thereof. The all-wheel same-phase driving trolley comprises a trolley body and a plurality of round wheels arranged on the trolley body. The number of the round wheels is even and is at least four. The round wheels are symmetrically arranged on two sides of the trolley body through driving components in a pairwise mode. A plurality of large friction force circular arc segments are uniformly distributed on each round wheel. The large friction force circular arc segments on every two round wheels which are symmetrically arranged are complementary and can form a whole circle. The phase positions of the large friction force circular arc segments on the round wheels which are located on the same side of the trolley body are the same. The friction force produced by the round wheels on the two sides of the trolley body is different, and the deviation phenomenon of the trolley body occurs during speed changing, so that trolley turning is achieved. The all-wheel same-phase driving trolley is simple and reliable in integral structure, has the characteristics of being high in efficiency, good in land surface adaptability and high in obstacle crossing capability and can be used for mobile robots, obstacle crossing vehicles and other mobile devices which need to walk on the uneven ground and the even ground.