In this paper， the Shear Thickening Polishing （STP） method is proposed to realize the low-cost， high-efficiency overall high-quality polishing of the complex double helix surface of the carbide drilling tool，aiming at the problem of low efficiency of surface processing of cemented carbide drilling tools. First， non-Newtonian polishing fluid with shear-thickening properties was prepared. Then their rheological properties were tested using an MCR302 rotational rheometer. Based on the rheological properties of the shear thickening polishing slurry， the body clearance， the margin， and the helical surface of the flutes of the cemented carbide twist drill were polished. Using the control variable method， the influence of the rotational speed of the polishing groove and the rotational speed of the workpiece on the surface quality and material removal rate of the cemented carbide twist drill was analyzed. The experimental results show that the overall surface roughness Ra of the processed twist drill first decreases and then increases with the increase of the rotational speed of the polishing groove， and the effect of processing is the best when the rotational speed of the polishing groove is 90 r/min. The overall Ra of the twist drill first decreases and then remaines basically unchanged or slightly increases with the increases of the rotational speed of the workpiece， and the effect of processing is the best when the rotational speed of workpiece is 3 500 r/min. The material removal rate of the twist drill is positively correlated with the rotational speed of the polishing groove， and the rotational speed of the workpiece. Under the optimal processing parameters of the rotational speed of the polishing groove of 90 r/min and the rotational speed of the workpiece of 3 500 r/min， the twist drill was processed using STP technology for 60 min， the Ra of the body clearance， the margin and the helical surface of the flutes change from the original 310 nm， 450 nm and 270 nm to 10 nm， 243 nm and 15 nm， respectively， the grinding marks of the body clearance and the helical surface of the flutes almost disappeared， and the defects at the cutting edge of the flutes were significantly reduced.