The utility model relates to the technical field of 3D (three-dimensional) screen cloth testing, in particular to a device for testing the air permeability of 3D screen cloth, which can be used for accurately and quickly testing the air permeability of the 3D screen cloth. Comprising a
workbench which is fixedly arranged on the ground and comprises a fixing frame fixedly installed on the
workbench and further comprises a bent
pipe fixedly installed on the fixing frame; the lifting
assembly is arranged on the
workbench; the air injection mechanism is arranged on the lifting
assembly, the vertical height is controlled through the lifting
assembly, and the air injection mechanism is used for conveying
compressed air; the testing mechanism is fixedly mounted on the workbench, is communicated with the bent
pipe and is used for displaying a testing result; the testing mechanism further comprises a ventilation base which is fixedly installed on the workbench, an
air channel is arranged in the ventilation base in a communicating mode, and the input end of the
air channel is communicated with the output end of the bent
pipe. The
test tube is fixedly mounted on the ventilation base, and the bottom end of the
test tube is communicated with the output end of the
airway; the floating ball is arranged in the
test tube in a sliding manner; and the scale marks are arranged on the outer side wall of the test tube.