Novel drilling bucket of rotary drilling machine

The utility model relates to a novel drilling bucket of a rotary drilling machine. A drill bit plate cover opening control mechanism of the rotary excavating drilling bucket is optimized and improved, a linkage locking mechanism composed of the shrinkage pipe, the push rod, the second spring, the locking key seat and the locking key plate is used for replacing a shrinkage pressing rod, and the locking and unlocking states of the shrinkage pipe and the push rod can be controlled through the arrangement of different widths on the locking key plate. Therefore, the push rod can be automatically contracted into the contraction pipe after finishing jacking and opening the drill bit plate, and continuous lifting of the drilling bucket body is not affected. According to the whole device, opening of the drill bit plate and discharging of soil in the drilling bucket body are facilitated, shaking of the drilling bucket is not needed, discharging work is rapid and convenient, vibration noise cannot be generated, and nois