An autonomous cleaning robot comprising: - a main body including a lower face configured to be oriented towards a surface to be cleaned and a suction mouth opening into the lower face of the main body, the main body delimiting a suction chamber fluidly connected to the suction mouth, - a rotating cleaning brush housed in the suction chamber and movably mounted in rotation about a brush rotation axis, - a suction unit which is housed at least partially in the main body and which is configured to generate an air flow through the suction mouth, - a waste collection device comprising a waste collection container located at the rear of the suction chamber and upstream of the suction unit and configured to be traversed by the air flow generated by the suction unit and to retain waste transported by the air flow, - a waste guide channel fluidly connecting the suction chamber to the waste collection container, the waste guide channel having a generally cylindrical shape and being configured to extend substantially vertically when the autonomous cleaning robot rests on a horizontal surface, - a lower deflector located at the rear of the brush rotation axis and extending at least partially opposite an inlet opening of the waste guide channel, the lower deflector comprising a lower deflection surface which partially delimits the suction chamber and which is configured to deflect, upwards and towards the waste guide channel, waste thrown backwards by the rotating cleaning brush onto the lower deflection surface, characterized in that it comprises an upper deflector extending at least partially opposite an outlet opening of the waste guide channel, the upper deflector comprising an upper deflection surface which is configured to deflect, backwards and towards the waste collection container, waste exiting, upwards, from the waste guide channel. - a main body including a lower face configured to be oriented towards a surface to be cleaned and a suction mouth opening into the lower face of the main body, the main body delimiting a suction chamber fluidly connected to the suction mouth, - a rotating cleaning brush housed in the suction chamber and movably mounted in rotation about a brush rotation axis, - a suction unit which is housed at least partially in the main body and which is configured to generate an air flow through the suction mouth, - a waste collection device comprising a waste collection container located at the rear of the suction chamber and upstream of the suction unit and configured to be traversed by the air flow generated by the suction unit and to retain waste transported by the air flow, - a waste guide channel fluidly connecting the suction chamber to the waste collection container, the waste guide channel having a generally cylindrical shape and being configured to extend substantially vertically when the autonomous cleaning robot rests on a horizontal surface, - a lower deflector located at the rear of the brush rotation axis and extending at least partially opposite an inlet opening of the waste guide channel, the lower deflector comprising a lower deflection surface which partially delimits the suction chamber and which is configured to deflect, upwards and towards the waste guide channel, waste thrown backwards by the rotating cleaning brush onto the lower deflection surface, characterized in that it comprises an upper deflector extending at least partially opposite an outlet opening of the waste guide channel, the upper deflector comprising an upper deflection surface which is configured to deflect, backwards and towards the waste collection container, waste exiting, upwards, from the waste guide channel.