Large-flow miniature diaphragm pump

The utility model provides a large-flow miniature diaphragm pump, which comprises an upper cover, a detection assembly, a transmission assembly and a motor, two pipe fittings are arranged on the upper cover, the detection assembly comprises a Hall element, an impeller and a fixing frame, the two pipe fittings are vertically arranged in an extending manner, one pipe fitting comprises a first section part and a second section part, and the other pipe fitting comprises a second section part and a third section part. The first section part is connected between the second section part and the upper cover, the diameter of the first section part is larger than that of the second section part, the fixing frame is located at the first pipe fitting in an inserted mode, the impeller is composed of a plurality of blades, and the blades are arranged in a spiral extending mode in the axial direction of the pipe fitting. An output shaft of the motor is inserted and positioned in the middle of the eccentric wheel, and the ra