HST series feeding and pre-screening combination machine is composed of independent operation of plate feeder and grizzly screen, plate feeder precisely control the feeding amount, grizzly screen and feeder separate operation, not affected by the feeder frequency, can be set separately stroke size and speed, so as to provide better screening effect. It is widely used in quarry, mining, building materials, electric power, coal and chemical industries, suitable for high content of fine material feeding and pre-screening of raw materials.