The invention relates to a competition robot, particularly to a chassis of an omnidirectional moving competition robot. The chassis is characterized in that an omnidirectional wheels are mounted on a wheel frame through wheel shafts, and the wheel frame is connected with a body through a guide post and a compression spring; each omnidirectional wheel is respectively driven by a servo motor thereof, and a driver of the servo motor is mounted in a control cabinet; the periphery of the body are respectively provided with infrared sensors; optical matrix sensors are mounted at a lower part in the centre of the body in a matrix manner; a gyroscope is mounted at an upper part of the control cabinet; a singlechip is mounted in the control cabinet and fixed at the centre of the chassis; and the gyroscope, the servo motors, the optical matrix sensors and the infrared sensors are respectively connected with the singlechip in the control cabinet; the chassis of the omnidirectional moving competition robot can freely move in a competition terrain in transverse direction, longitudinal direction or oblique direction under the control of the singlechip; the configured optical matrix sensors and the gyroscope can be used for location of the robot in the competition terrain, and requirements on the movement of the robot in the current various robot competitions can be satisfied.