The invention discloses a novel kitchen aste source classification and pretreatment system, which includes a seat body and an engagement portion for cooperating with the seat body, A lumen is arrangein that left end face of the seat body, a turning hole is connected with the inner wall of the right side of the lumen, A rotary table is rotatably fitted in the rotary hole, A linkage element is arrange in that rotating table, the left end face of the seat body on the upper side of the cavity is rotatably fitted with an arm rod, At that bottom end of the arm rod, a fixing shell is fixedly arrange, A left and right through groove are arranged in that front end face of the fix shell, A first sliding cavity is arranged in the top wall of the groove and extends upward and downward, A space blockis installed in the sliding fit in the first sliding cavity, Between that top end of the isolate block and the top wall of the first sliding cavity, a first elastic strip is press fit, a second sliding cavity is arranged through the right inner wall of the first sliding cavity, and a hand rod fixedly connected with the isolating block is mounted in the second sliding cavity in sliding fit.