The invention discloses an environment-friendly household waste briquetting machine. The environment-friendly household waste briquetting machine comprises an installation rack, a bucket, first bufferbuckets, second buffer buckets and collecting buckets, wherein the bucket is installed on the top of the installation rack, two discharging outlets are formed in the bottom of the bucket, the two buffer buckets are installed on the portion, below the discharging outlets, in the installation rack, the second buffer buckets are installed on the portions, below the first buffer buckets, in the installation rack respectively, and the collecting buckets are installed on the portions, below the second buffer buckets, in the installation rack. By means of the environment-friendly household waste briquetting machine, it is ensured that the size of wastes added to an inner box is mastered under the condition that the volume of the inner box keeps unchanged, the wastes are easily briquetted with the lowest energy, and the running energy loss of the device is reduced. Paddle pieces paddle the wastes on the top side in the inner box along with the rotation of a rotary base, the wastes on the bottom are leveled, the situation that the wastes in the inner box are stacked ups and downs is avoided, it is ensured that after subsequent briquetting, the wastes are compacted, and the loose situationis avoided.