The invention discloses an injector flow characteristic tester which comprises a host and a test machine. The host comprises a host frame, an injector clamping mechanism, a transmission mechanism, a control unit, a communication module and a power module, wherein the injector clamping mechanism, the transmission mechanism, the control unit, the communication module and the power module are mounted on the host frame, the transmission mechanism is connected with the injector clamping mechanism, the power module is connected with the control unit, the communication module and the transmission mechanism, and the control unit is connected with the communication module and the transmission mechanism. The test machine comprises a balance support, an electronic balance, a water tank and an injection needle, wherein the electronic balance is mounted on the balance support, the water tank is mounted on the electronic balance, the injection needle is mounted in the water tank through the balance support, the electronic balance is connected with the communication module through a communication wire, and the injection needle is connected with the injector clamping mechanism through a hose. The injector flow characteristic tester is simple in structure, low in cost and high in intelligence, and use efficiency of testing staff can be greatly improved.