A assault robot having four wheel-legs, comprising a support plate (1), a circuit board (7), and four legs. Each of the four legs consists of a rotating servo (2), a swing servo (3), a direct current motor (4), and a wheel (5). An output shaft of the rotating servo (2) is fixed to the support plate (1) in a vertical direction, and a housing of the swing servo (3) is fixed to a housing of the rotating servo (2). An output shaft of the swing servo (3) is in the longitudinal direction of the support plate (1), and an output shaft of the direct current motor (4) is in the crosswise direction of the support plate (1). The direct current motor (4) is fixed to the output shaft of the swing servo (3) via a U-shaped support frame (6), and the wheel (5) is fixed to the output shaft of the direct current motor (4). The support plate (1) is provided with an electromagnetic gun (8) and a power supply capacitor (9). By controlling the direct current motors (4), the present invention enables agile forward movement, backward movement, turning movement, and spinning movement of the robot, and enables, by controlling the swing servos (3) and the rotating servos (2), the robot to walk on the four legs, thus achieving obstacle crossing and obstacle avoidance of the robot, and providing thereto the ability to travel in a complex environment. In addition, an assault on a target can be achieved by the electromagnetic gun (8).