When a blowout accident happens, throttle valve is the key device to control the flow velocity of fluid in a well, so its erosion resistance shall be stronger. At present, however, the evaluation on the anti-erosion performance of throttle valves mostly focuses on finite element analysis or fluid field simulation calculation, with neither measured data nor qualitative and quantitative evaluation, which brings great difficulties to the selection and application of throttle valves. In this paper, an experimental idea was adopted of adjusting the experimental pressure and fluid velocity based on the remote control of valve opening and keeping the nitrogen injection pressure slightly higher than the experimental pressure to ensure that the gas is effectively mixed to form three-phase fluid. Closed-loop simulation was performed on the erosion of blowout on three kinds of throttle valves (orifice-type throttle valves, cylindrical throttle valves and wedge-shaped throttle valves) under different flow velocities, different fluid components and different pressures. And the following experimental results were obtained. First, from the viewpoint of erosion resistance, three kinds of throttle valves are ranked as a cylindrical throttle valve ＞a wedge-shaped throttle valve ＞an orifice-type throttle valve. Second, within the experimental pressure range, a wedge-shaped throttle valve has slight erosion marks on the valve core and unilateral erosion on the downstream nipple, indicating that its erosion resistance is weak. Third, when the opening of an orifice-type throttle valve is 1/8, the experimental pump pressure drops back to 4 MPa for many times, and the rear end of the valve core is seriously eroded. Finally, according to the experimental results, the improvement ideas of changing the core's shape of a wedge-shaped throttle valve, optimizing the material and adding seals on the side of an orifice-type throttle valve were put forward. In conclusion, the three-phase fluid erosion resistance evaluation method can be used to evaluate throttle valves of similar structure.