The invention relates to an S type carbon-free trolley of an elbow crank slider mechanism, and belongs to the technical field of mechanical design. The S type carbon-free trolley comprises a bottom plate device, a gearwheel device, a driving wheel device, a driven wheel device, a steering device, a push rod device, a front wheel device and a support device, wherein the gearwheel device is arrangedat the back part of the bottom plate device; the driving wheel device is arranged at one side of the bottom plate device; the driven wheel device is arranged at the other side of the bottom plate device; the steering device and the push rod device are arranged on the bottom plate device; the front wheel device is arranged at the front part of the bottom plate device, and is connected with the push rod device; and the support device is arranged at the middle part of the bottom plate device. The elbow crank slider mechanism is used for controlling the steering, so that the steering precision ofthe trolley can be improved, so that the trolley can precisely complete the steering; the gravity center of the trolley is more centered; the gravity center of the trolley is stable in the walking and steering processes; the walking stability of the trolley can be improved; the trolley can be easily started to walk; the structure of the trolley is simple; the processing and the assembly are easy;and the popularization and the application are convenient.