The utility model discloses a guide chute of a lime-calcination vertical preheater, wherein the guide chute (2) is a hollow bracket the upper part of which is in a circular arc shape; a working inclined plane at the front end of the guide chute extends above a tail necking (3) of a rotary kiln and an inclined angle of 39 degrees is formed by the working inclined pane and the horizontal direction; the upper end of the guide chute is fixed on a base plate of a guide cylinder (1) of the vertical preheater through bolts; the vertical end of the guide chute is fixed on a panel (4) at the front part of a feeding chamber of the vertical preheater through bolts; a hollow hole of the guide chute is communicated with an air inlet which is newly arranged on the panel at the front part of the feeding chamber of the vertical preheater; and a ventilation pipe (5) is arranged at the left end of the air inlet. The guide chute (2) is the hollow bracket the upper part of which is in a circular arc shape, wherein the upper part in a circular arc shape is beneficial to falling materials and the hollow bracket increases forced fixed points. The arranged ventilation pipe can input cold air to rapidly cool the guide chute, reduce the heated temperature of the guide chute, ensure that the guide chute can work in high-temperature environment for a long term, improve the running rate of the equipment and reduce the maintenance charge.