The invention discloses an improved hole drilling device for ball-shaped jade. The improved hole drilling device comprises a machine frame, a main turntable, a sub turntable, a main transmission device, a sub transmission device, a main motor, a sub motor, a hole drilling assembly and a third transmission device, wherein the main transmission device is connected with the main turntable, the sub transmission device is connected with the sub turntable, the main motor is used for driving the main transmission device to work, the sub motor is used for driving the sub transmission device to work, the hole drilling assembly is used for carrying out hole drilling work on the jade, the third transmission device is connected with the hole drilling assembly, the main turntable and the sub turntable are in parallel arrangement and are rotationally arranged on the machine frame, the rotating directions of the main turntable and the sub turntable are opposite, a plurality of main circular grooves are formed in the main turntable, a plurality of sub circular grooves are formed in the sub turntable, the main circular grooves and the sub circular grooves are matched with the tangent position parts of the main turntable and the sub turntable, and a clamp part used for clamping the jade is formed. The improved hole drilling device has the advantages that the hole drilling quality of the jade can be effectively ensured, and the processing efficiency is greatly improved.