Backpack type tree trunk whitewashing device

The utility model discloses a backpack type tree trunk whitewashing device which comprises a storage tank, a guide pipe is connected to the bottom of the storage tank, a handle integrated valve is arranged on the guide pipe, a shoulder strap is arranged on one side of the handle integrated valve, a support is arranged on the other side of the handle integrated valve and connected to the tail end of the guide pipe, and a rolling brush is rotationally connected to the interior of the support. A liquid outlet is formed in the surface of the side, close to the rolling brush, of the support. The device is provided with the shoulder straps for bearing the device, so that the hand load is reduced, meanwhile, the actions of repeatedly squatting up, lifting barrels, changing trees and whitewashing by personnel in conventional operation are avoided, and the labor intensity is reduced; the guide pipe body is long, the situation that when a tree crown is large and low, workers are not prone to getting close to a tree tru