The invention relates to the field of waste treatment and utilization, in particular to a waste continuous solid fermenting reacting device and a solid fermenting method. The waste continuous solid fermenting reacting device comprises a mixing tank (4) and a fermenting tank (5) below the mixing tank (4), wherein a strain inlet (6) and a material inlet (10) are arranged at the upper part of the mixing tank (4); a plurality of baffles (1) positioned below the strain inlet (6) and the material inlet (10) are arranged in the mixing tank (4); and the baffles (1) are staggered and inclined from two sides to the underside, and are all extended out of a centre line. According to the waste continuous solid fermenting reacting device and the solid fermenting method, uniform inoculating is achieved with the baffles and a flow dividing device; and a separating plate is adopted to enhance the transfer of the heat and the mass, so that the fermenting tank is uniformly divided into a plurality of small reacting spaces, and as a result, the substrates can be uniformly fermented, and the fermenting speed is increased; enhancing the waste solid fermenting reacting process is beneficial to expanding the solid fermenting as well as the production application.