Tin oxide pump

The utility model discloses a tin oxide pump comprising an impeller. An inlet of the impeller is connected with a pump cover, an outlet of the impeller is connected with an auxiliary impeller, the auxiliary impeller is sleeved with a flow guider in a connected mode, the other end of the auxiliary impeller is connected with a lower shaft, and the flow guider is connected with a protection tube through a connection block; framework oil seals are arranged between the flow guider and the lower shaft and between the connection block and the lower shaft; the lower shaft is connected with an upper shaft through a plurality of intermediate shafts; the lower shaft, the intermediate shafts and the upper shaft are sleeved with multiple protection tubes in a connected mode, the protection tubes are sleeved with connection tubes in a connected mode, the lower shaft, the intermediate shafts and the upper shaft are all supported by bearings, the bearings are in stationary fit with the shaft and are located in bearing pedestals, and the bearing pedestals are in concave-convex matching with the connection tubes; the upper end of the upper shaft is connected with a power system which is driven by a motor; both the connection tubes and the power system are arranged on a pump support. The tin oxide pump runs reliably and smoothly, the service life is prolonged, and the assembling cost and maintenance cost of a pump body are low.