The invention discloses an omni-directional mobile robot based on a Mecanum wheel. The robot comprises a chassis, the Mecanum wheel, a driver, a controller, a wireless communication module, a detection module, a visual transmission module and a power module; the front side and the rear side of the chassis are each provided with a stepping motor, the Mecanum wheel is connected with the stepping motors through a coupler, the structure is symmetric, and the controller on the chassis is connected with the driver, the wireless control module, the detection module, the visual transmission module andthe power module through a circuit, a traditional wheel type moving mechanism is improved, more flexibility is achieved, and the omni-directional characteristics are used for providing great convenience for storage and carrying; the independently-designed programmable driver is small in self weight, small in size, and high in drive capacity, and the space utilization rate of the robot is improved, an exponential type speed model is built, adjustable PWM soft starting and soft braking can be achieved, the drive manner of the stepping motors is optimized, and in combination with the manual modeand the automatic mode, the function of the omni-directional mobile robot is enriched.