A novel quadrotor parameter tester instrument has been designed to solve the problem that it is difficult to take into account the low cost and high precision of the tester instrument at the same time. At first, the relation model between rotor rolling velocity and thrust has been simplified, so it is with rotor rolling velocity and drag moment. Then the rigid joint between the tester instrument and the motor stator has been realized based on the theory of geostatics. Then the thrust of rotor was presented with the form of gravity, and the drag moment of rotor was presented with the form of moment. At last, the thrust coefficient and the drag coefficient were obtained by fitting and analyzing the experimentation data. In comparison with related data, the experimentation data shows that the precision of parameters have met the requirement of control. Further more, the ways and means of parameter determination are simple, the parameter tester instrument is cheap, and the realization of parameter determination in engineering is relatively easy.