The invention discloses a withering tank in tea processing equipment before extraction. The withering tank comprises a withering box with a cavity inside and further comprises a hollowed-out spreading and cooling plate connected at the upper part of the withering box, wherein the spreading and cooling plate comprises a plurality of first-level spreading and cooling plates which are arranged side by side and rotationally connected on two sides of the inner wall of the withering box; a cross rod is arranged on sides, connected with the withering box, of the first-level spreading and cooling plates; a pushing element is hinged to the cross rod; a material collection mechanism is mounted below the first-level spreading and cooling plates and comprises a material collection belt and a motor connected with the material collection belt; a discharge port corresponding to the material collection belt is formed in the withering box. With the adoption of the scheme, tea leaves on the first-level spreading and cooling plates can be poured into the material collection belt due to rotation of the first-level spreading and cooling plates, and the whole material collection process is accelerated; besides, dispersion of moisture in the tea leaves is accelerated due to the hollowed-out structure of the first-level spreading and cooling plate, and the withering speed of the tea leaves is increased.