The invention discloses a quenched steel part dry state and wet state coordinated cutting method. The method includes the steps that firstly, a numerically controlled lathe system machining program is compiled; secondly, the specification of a blade and the type of a tool bar are determined, and cutting parameters and the lane tip zero compensation amount are input in a tool setting mode; thirdly, tempered three jaws are utilized to clamp a workpiece; fourthly, a part is roughly turned and the allowance is left in a single side, wherein cutting liquid is not used in the machining process; fifthly, the part is machined in a semi-finish mode, and the allowance is formed, wherein the cutting liquid is not used in the machining process; sixthly, the cooling liquid is started to be sprayed on a lathe tool bit, and the external diameter and the end face are machined in place together. According to the quenched steel part dry state and wet state coordinated cutting method, the defects in the prior art are overcome, the rejection rate of parts are effectively reduced, the machining difficulty of the parts is lowered, and staff efficiency is improved.