Plug-in type low-flow-velocity flowmeter

The utility model discloses a plug-in type low flow velocity flowmeter which comprises a process pipeline, a fixing mechanism, an outer venturi, an inner venturi, a positive pressure tapping pipe and a negative pressure tapping pipe, the inner venturi is arranged at the front end of the outer venturi, the inner venturi is communicated with the negative pressure tapping pipe through a negative pressure tapping pipe nipple, the positive pressure tapping pipe is in an L shape, and the negative pressure tapping pipe is in an L shape. The positive pressure tapping pipe and the negative pressure tapping pipe are fixed in the process pipeline through the fixing mechanism, in the plug-in type low-flow-velocity flowmeter, rapid mounting and dismounting of the whole flowmeter can be achieved through the fixing mechanism, the practicability of the flowmeter is improved, rapid mounting and detection can be conveniently conducted on a certain position of the process pipeline, and the practicability of the flowmeter is imp