In view of the problems of the mechanical bell bottom drilling tool such as the separation of hole reaming from soil collecting and cleaning, complicated process, difficult cleaning of bottom settlements, low drilling efficiency , uncertainty in ensuring the quality and accuracy of reaming, the soil collecting bell bottom drilling tool based on the electro mechanical hydraulic integrated system has been developed. This paper mainly focuses on the drilling technology of soil collecting and bell bottom drilling, the mechanical hydraulic electric control system design for the soil collecting bottom expanding drilling tool, as well as testing of the electro mechanical hydraulic integrated system. The results show that the soil collection bell bottom drilling tool integrates functions of the soil collecting and the reaming to improve the accuracy of the belled diameter and the reaming precision, reduces the drilling procedures and improves the work efficiency, meeting the requirements of belled piles on the rotary drilling process and realizes the intelligently under reamed drilling.