in the present invention are disclosed a step type ratchet wheel mechanism and a turning switch with step type ratchet wheel mechanism , wherein comprising : camshaft circular disc , on its end surface is disposed at least one groove , on its rim is disposed at least one positioning slot ; driving cam , on its end surface is disposed at least one groove , on its rim is disposed at least one angular shape tooth ; first pawl and second pawl ; one resilient element is contained in the chamber , which is formed from two corresponding grooves respectively disposed on the end surfaces of camshaft circular disc and driving cam . when said camshaft circular disc is at a control - position , first pawl falls into one positioning slot of camshaft circular disc ; when said driving cam is being turned toward next control - position , said two grooves will be staggered , said resilient element is compressed ; when said driving cam is turned to the next control - position , one angular shape tooth will push first pawl out from said positioning slot , the released resilient element will cause said camshaft circular disc turning to the next control - position , and then second pawl will fall into another positioning slot of camshaft circular disc . in use of the present invention , the acted force is even , the operation is steady , the hand handle is comfortable , and furthermore , the phenomenon of hung - up point between two adjacent control - positions also may be avoided .