External mixing type double-fluid nozzle atomization performance test system

The invention discloses an external mixing type double-fluid spray head atomization performance testing system which is used for performing a spray head atomization performance testing experiment, a microbial pesticide activity testing experiment or a spray head abrasion testing experiment. The system comprises a fog drop measuring instrument, a measurement and control device and a test device, the measurement and control device comprises a control unit, a data acquisition unit and a data processing unit; the test device comprises spray head bodies, a fog amount collecting table and a liquid supply unit, spray heads of matched models are installed on the spray head bodies according to tests conducted by the system, the fog amount collecting table is arranged under the spray heads, and inserting holes used for containing fog amount collecting pipes are evenly distributed in the fog amount collecting table; the fog drop measuring instrument directly faces an area between the spray head and the fog amount collec