The invention relates to an upper arm 
tourniquet for the 
ulna / 
radius fracture operation. A 
tourniquet needs to be bound on an upper arm in the 
forearm fracture operation process in the orthopaedics department; at present, the binding of a rubber 
pipe applied to the field can not last for a long time, the tightness degree can be known only through feeling, and once the tightness degree is not appropriate, the operation needs to be repeated again. The upper arm 
tourniquet comprises a tourniquet body which is a high-resillence strip-shaped soft belt made of 
polyurethane, and a plurality of vent holes are formed in the tourniquet body. The upper arm tourniquet further comprises a hard adjustment plate, an inflation bag and an 
extrusion sacculus, wherein the hard adjustment plate is in an arc shape, long groove holes are formed in the two ends of the hard adjustment plate respectively, the tourniquet body is in an annular shape and penetrates through the long groove holes, the inflation bag is arranged between the tourniquet body and the hard adjustment plate and is connected with the 
extrusion sacculus through an inflation hose, and a 
ball valve is arranged on the 
extrusion sacculus. The upper arm tourniquet is high in binding and detaching speed, and can be used for long-time continuous 
hemostasis especially the 
ulna / 
radius fracture operation in the orthopaedics department.