A dustproof equipment, comprising a frame body, a dustproof screen, and a back-blowing unblocking device for the dustproof screen of a dryer, wherein the back-blowing unblocking device is located above the dustproof screen, the dustproof screen and the back-blowing unblocking device for the dustproof screen of the dryer are both disposed on the frame body, in a process of conveying materials of the material conveyor belt, a dry airflow is blown to the dustproof equipment by the material conveyor belt, so that dust generated in a drying process is attached to the dustproof screen, the back-blowing unblocking device for the dustproof screen of the dryer, fully utilizing a vacant closed compartment space of the dryer, a matching non-stop multi-row back-blowing spray high-pressure air unblocking device being added to the dustproof screen, the back-blowing unblocking device for the dustproof screen of the dryer comprising a high-pressure air main pipe, a high-pressure air horizontal pipe, a shunt connecting pipe, and back-blowing fan-shaped nozzles, and the high-pressure air main pipe is connected with an air source valve through a hose; characterized in that, the back-blowing unblocking device for the dustproof screen of the dryer comprises high-pressure air branch pipes, a length of each high-pressure air branch pipe is equal to a length of an A-shaped dustproof screen, both ends of the each high-pressure air branch pipe are closed and an upper center opening is welded to the shunt connecting pipe, both sides of the each high-pressure air branch pipe are arranged with the back-blowing fan-shaped nozzles, and the back-blowing fan-shaped nozzles are evenly arranged in an interlaced form, a row number of the high-pressure air branch pipes is equal to a segment number of the A-shaped dustproof screen, the back-blowing unblocking device for the dustproof screen of the dryer is mounted on the dustproof screen to make the back-blowing fan-shaped nozzles located between the two A-shaped dustproof screens; except for the back-blowing fan-shaped nozzles, all others are welded and formed by stainless steel pipe materials; the dustproof equipment is located above a material conveyor belt; the dustproof equipment comprises a plurality of sub-dustproof assemblies, the plurality of sub-dustproof assemblies being disposed at intervals in a conveying direction of the material conveyor belt, each of the sub-dustproof assemblies comprising: a bracket, the bracket comprising a first support plate body and a second support plate body, the first support plate body and the second support plate body being disposed at an angle, one dustproof screen being laid on the first support plate body, and another dustproof screen being laid on the second support plate body. the back-blowing unblocking device for the dustproof screen of the dryer comprises high-pressure air branch pipes, a length of each high-pressure air branch pipe is equal to a length of an A-shaped dustproof screen, both ends of the each high-pressure air branch pipe are closed and an upper center opening is welded to the shunt connecting pipe, both sides of the each high-pressure air branch pipe are arranged with the back-blowing fan-shaped nozzles, and the back-blowing fan-shaped nozzles are evenly arranged in an interlaced form, a row number of the high-pressure air branch pipes is equal to a segment number of the A-shaped dustproof screen, the back-blowing unblocking device for the dustproof screen of the dryer is mounted on the dustproof screen to make the back-blowing fan-shaped nozzles located between the two A-shaped dustproof screens; except for the back-blowing fan-shaped nozzles, all others are welded and formed by stainless steel pipe materials; the dustproof equipment is located above a material conveyor belt; the dustproof equipment comprises a plurality of sub-dustproof assemblies, the plurality of sub-dustproof assemblies being disposed at intervals in a conveying direction of the material conveyor belt, each of the sub-dustproof assemblies comprising: a bracket, the bracket comprising a first support plate body and a second support plate body, the first support plate body and the second support plate body being disposed at an angle, one dustproof screen being laid on the first support plate body, and another dustproof screen being laid on the second support plate body.