In order to explore the law of rock breaking efficiency of existing non planar teeth in sandstone, indoor single tooth rock breaking experiment and numerical simulation of rock breaking are carried out for planar teeth, sharp circular teeth and axe teeth, and the effects of different eating depth and rake angle on rock breaking efficiency of PDC teeth are analyzed. Compare the experimental results with the simulation results. Firstly, for the trend, the trend of the experimental results and the simulation results is the same. Secondly, through the extraction and comparison of the data, the maximum error of the data is 9% and the minimum error is 1%. Therefore, it is considered that the analysis result is true and the analysis method is effective. The results show that increasing the feed depth of PDC teeth will increase the cutting force of PDC and the volume of broken rock; Under the same conditions, the volume of rock broken by plane teeth is larger than that of axe teeth and sharp circular teeth; Under the same conditions, the cutting force of axe tooth is greater than that of the other two teeth. For plane tooth, the best working condition of broken sandstone is raking angle of 15 ° and depth of 1mm; For sharp round teeth, the best working condition of broken sandstone is rake angle of 5 ° and draft depth of 2mm; For axe teeth, the best working condition of broken sandstone is rake angle of 20 ° and draft depth of 3mm; Comprehensively comparing the effect of three teeth in crushing sandstone, the axe type has the best crushing effect.