The invention discloses an ore crushing and screening device. The ore crushing and screening device comprises a supporting plate, an ore crushing module, an ore screening module, a conveying belt anda small-particle ore receiving groove. The ore crushing module comprises a crushing tank, a feeding hole, a discharging hole, a first gear, a second gear, a first motor, a crushing shaft and a baffle;and the ore screening module comprises a screening pipeline, a connecting sleeve, an annular ring, a second motor, a connecting piece, a rotating shaft and a screening feeding slideway. According tothe ore crushing and screening device, crushing, screening and transferring of ore are integrated, the autonomy of ore machining can be guaranteed, the ore machining efficiency is improved, and unnecessary manpower and material resource investment is reduced. The problems that in the prior art, the ore generally needs to be manually transferred into a screening machine to be screened after being crushed, a specially-assigned person is still needed for collection in the screening process, the whole process is low in efficiency, and manpower and material resource consumption is large are solved.