Pollutant particle injection device for fluid pollution test

The invention provides a pollutant particle injection device for a fluid pollution test. The pollutant particle injection device comprises a base, a first supporting seat, a second supporting seat, a screw shaft positioning cylinder, a screw shaft outer cylinder, a screw shaft, a material containing device, a three-way high-pressure pipe and a hose, the high-pressure air inlet is connected with the material containing device through the hose, so that a communicating vessel effect is formed in a high-pressure air flowing area, the air pressure in the device is better adjusted, the same pressure intensity is formed above and below the device, particles can overcome the action of high-pressure air, blanking is conducted by means of the gravity of the particles, other power devices are not needed, and the device is simpler in structure and lower in energy consumption. The feeding channel and the discharging channel are arranged on the screw shaft outer barrel in a staggered mode, the length of the mixing channel