The utility model belongs to the technical field of the building, a novel clear hole of bar planting for building engineering device is disclosed, hole -cleaning device's the empty set -top face of pressure has the drying -machine through the bolt fastening, press empty quick -witted right -hand member to link up the blowpipe, the drying -machine right -hand member links up drying duct, drying duct passes through change over switch and connects the blowpipe, it has the heating pipe to inlay in the drying -machine, the heating pipe passes through the wire and connects the controller of fixing on the shell of pressing empty machine, the temperature -sensing ware in drying duct is inlayed through the wire connection to the controller, the controller passes through the wire and still connectsand fix servo motor on the shell of pressing empty machine, servo motor connects clear hole brush head through flexible arm. The utility model discloses the drying -machine can keep the drying in barplanting hole drying to the bar planting hole after the clearance, the steadiness of promotion bar planting.