Material crushing and screening equipment for highway construction and operation method

The invention discloses material crushing and screening equipment for highway construction and an operation method, and relates to the technical field of screening equipment. According to the material crushing and screening equipment for highway construction, when stone blocks clamped between the screen bars are cleaned, the screen bar spacing is expanded by adjusting the screen bar spacing, then the stone blocks directly fall off, cleaning is completed, and compared with a traditional manner that the stone blocks are directly extruded between the screen bars through beating, the screen bars are effectively protected, and the service life of the material crushing and screening equipment is prolonged. The screen bars and the screen frame are connected through the lifting assembly, the driving plate, the driving column and the limiting assembly which are used for adjusting the distance between the screen bars, manual operation is not needed for unlocking and locking when the screen bars are disassembled and ass