The company developed a wheel shaft of sintering trolley, including the first section of wheel shaft and the tail section of wheel shaft; The first segment of the wheel shaft includes a wheel mounting segment and a first butt joint segment for mounting the wheel. The first butt joint segment is provided with butt joint holes and dovetail grooves extending along its axis direction; The dovetail groove is located on the hole wall of the docking hole and is connected with the docking hole; The wheel shaft tail section includes a shaft sleeve installation section and a second butt joint section for interference fit with the shaft sleeve, and the second butt joint section includes a butt joint main body and a dovetail bulge; The butt joint main body is matched with the butt joint hole, and the dovetail bulge is matched with the circumferential limit of the dovetail groove; The hole wall of the butt hole is provided with a first connecting hole; The docking body is provided with a second connecting hole opposite to the first connecting hole; The first connecting hole and the second connecting hole are detachably connected by a connecting piece threaded between them. The above scheme can solve the problems of long time-consuming and high maintenance cost of wheel shaft replacement. The utility model also provides a sintering trolley and a wheel assembly of the sintering trolley.