Dry powder prepressing and rolling combined briquetting device

The invention discloses a dry powder prepressing and rolling combined briquetting device. The briquetting device comprises a machine frame, a prepressing mechanism, a rolling mechanism and a press roll protection mechanism, wherein the prepressing mechanism comprises a hopper, a prepressing cavity, a uniform discharging mechanism and a power device; the rolling mechanism comprises a first press roll assembly and a second press roll assembly; a cavity for forming a dry powder material is formed in the circumferential surface of each of first and second press rolls; the prepressing cavity comprises side baffles positioned on two sides and a bottom plate connected to the bottoms of the side baffles on the two sides; a discharging hole is formed between the side baffle on each side and the bottom plate; the press roll protection mechanism comprises at least one pair of supporting rolls; and at least one supporting roll is connected with an oil cylinder. Particles different in compactness can be formed without wat