In order to test the flow capacity of hydraulic quick-action couplings at different fluid medium,flowrate or other working conditions,a pressure drop-flowrate characteristic test platform for hydraulic quick-action couplings was designed,and the matching test software was developed.The No.46 hydraulic oil or water were used as the test medium with its flowrate ranging from 40 L/min to 1 000 L/min.The pressure drop of the applicable hydraulic quick-action couplings was from 0 MPa to 5.0 MPa and the nominal diameter was from 12.5 mm to 51 mm.Besides,according to the standards of ISO 9110-1:2010 and ISO 9110-2:2020,a mathematical model for measuring the pressure drop was established,and the combined uncertainties of pressure drop using the No.46 hydraulic oil or water as the test medium were calculated respectively.The technical parameters of the test platform comply with GB/T 5861—2003.The test platform can also be used to measure the flow coefficient and flow resistance coefficient of the hydraulic quick-action couplings.