A waste collecting device , comprising a frame , a waste buffer box , a negative pressure flow-equalizing box and a waste collecting box , wherein the waste buffer box is arranged on an upper part of the frame , the waste buffer box is provided thereon with a waste pipeline the waste pipeline is configured to extend to an operation station to make generated waste transported to the waste buffer box , the negative pressure flow-equalizing box is arranged on a top of the waste buffer box , the negative pressure flow-equalizing box is communicated with the waste buffer box , the negative pressure flow-equalizing box is configured to equalize gas flowing in from the waste buffer box , and a negative pressure pipeline is arranged on the negative pressure flow-equalizing box , the negative pressure pipeline is configured to draw out gas in the negative pressure flow-equalizing box , and the waste collecting box is movably arranged at a lower part of the frame and is selectively communicated with the waste buffer box for collecting waste dropped from the waste buffer box , wherein the waste collecting device further comprises a waste compressing box disposed between the waste buffer box and the waste collecting box , the waste compressing box is selectively communicated with the waste buffer box , the waste compressing box is selectively communicated with the waste collecting box , and the waste compressing box is configured to temporarily store the waste dropped from the waste buffer box and compress the waste, characterized in that a negative pressure branch pipeline is further provided on the negative pressure pipeline, and the negative pressure branch pipeline communicates with the waste compressing box , a compression flow-equalizing box is further arranged on the waste compressing box , a second flow-equalizing plate is arranged between the compression flow-equalizing box and the waste compressing box , a plurality of second flow-equalizing holes are provided on the second flow-equalizing plate, and the compression flow-equalizing box communicates with the waste compressing box through the plurality of second flow-equalizing holes, and the second flow-equalizing plate and the negative pressure branch pipeline are arranged at interval. wherein the waste collecting device further comprises a waste compressing box disposed between the waste buffer box and the waste collecting box , the waste compressing box is selectively communicated with the waste buffer box , the waste compressing box is selectively communicated with the waste collecting box , and the waste compressing box is configured to temporarily store the waste dropped from the waste buffer box and compress the waste, characterized in that a negative pressure branch pipeline is further provided on the negative pressure pipeline, and the negative pressure branch pipeline communicates with the waste compressing box , a compression flow-equalizing box is further arranged on the waste compressing box , a second flow-equalizing plate is arranged between the compression flow-equalizing box and the waste compressing box , a plurality of second flow-equalizing holes are provided on the second flow-equalizing plate, and the compression flow-equalizing box communicates with the waste compressing box through the plurality of second flow-equalizing holes, and the second flow-equalizing plate and the negative pressure branch pipeline are arranged at interval. <EOS>