A washing system comprising: an autonomous traveling work machine configured to execute a predetermined work while traveling autonomously; and a washing station, the autonomous traveling work machine comprises: a work machine main body; a controller configured to control an operation of the work machine main body so that the work machine main body is washed with a washing liquid being supplied from a washing station; and a work unit configured to execute the predetermined work, wherein the work unit comprises a work member configured to execute the predetermined work, and a first drive for rotationally driving the work member; wherein the washing station is equipped with a water supplier characterized in that the water supplier is configured to supply the autonomous traveling work machine with the washing liquid, and in that the autonomous traveling work machine further comprises: a water receiver for receiving the washing liquid from the water supplier when the autonomous traveling work machine is disposed on the washing station, and a spreading member for spreading the washing liquid on the work member, wherein the spreading member comprises an opening for causing the washing liquid to flow out, and wherein the controller is configured to operate the work unit so that the work machine main body is washed so as to cause the first drive to rotationally drive the work member and the spreading member. an autonomous traveling work machine configured to execute a predetermined work while traveling autonomously; and a washing station, the autonomous traveling work machine comprises: a work machine main body; a controller configured to control an operation of the work machine main body so that the work machine main body is washed with a washing liquid being supplied from a washing station; and a work unit configured to execute the predetermined work, wherein the work unit comprises a work member configured to execute the predetermined work, and a first drive for rotationally driving the work member; wherein the washing station is equipped with a water supplier characterized in that the water supplier is configured to supply the autonomous traveling work machine with the washing liquid, and in that the autonomous traveling work machine further comprises: a water receiver for receiving the washing liquid from the water supplier when the autonomous traveling work machine is disposed on the washing station, and a spreading member for spreading the washing liquid on the work member, wherein the spreading member comprises an opening for causing the washing liquid to flow out, and wherein the controller is configured to operate the work unit so that the work machine main body is washed so as to cause the first drive to rotationally drive the work member and the spreading member. a work machine main body; a controller configured to control an operation of the work machine main body so that the work machine main body is washed with a washing liquid being supplied from a washing station; and a work unit configured to execute the predetermined work, wherein the work unit comprises a work member configured to execute the predetermined work, and a first drive for rotationally driving the work member; wherein the washing station is equipped with a water supplier characterized in that the water supplier is configured to supply the autonomous traveling work machine with the washing liquid, and in that the autonomous traveling work machine further comprises: a water receiver for receiving the washing liquid from the water supplier when the autonomous traveling work machine is disposed on the washing station, and a spreading member for spreading the washing liquid on the work member, wherein the spreading member comprises an opening for causing the washing liquid to flow out, and wherein the controller is configured to operate the work unit so that the work machine main body is washed so as to cause the first drive to rotationally drive the work member and the spreading member. a water receiver for receiving the washing liquid from the water supplier when the autonomous traveling work machine is disposed on the washing station, and a spreading member for spreading the washing liquid on the work member, wherein the spreading member comprises an opening for causing the washing liquid to flow out, and wherein the controller is configured to operate the work unit so that the work machine main body is washed so as to cause the first drive to rotationally drive the work member and the spreading member.