The invention discloses a combined cabinet with adjustable reagent frames. The combined cabinet comprises a combined cabinet body which is of a hollow structure, wherein sliding chutes are formed in the inner walls of the top side and bottom side of the combined cabinet body, one support rod is mounted in the two sliding chutes in a sliding manner and is sleeved with two reagent frames, through holes are formed in the two reagent frames and are connected with the support rod in a sliding manner, sliding rod through holes are formed in the inner walls of one sides of the through holes, slidingrods are mounted in the sliding rod through holes in a sliding manner, and two ends of the sliding rods extend outside the sliding rod through holes; and a first fixed slot is formed in one side, close to the sliding rod through hole, of the support rod, and one ends, close to the support rod, of the sliding rods are connected with the first fixed slot in a sliding manner. The combined cabinet issimple in structure and convenient to use, the reagent frames can be rapidly adjusted and fixed, the operation is easy, the time is saved, the functionality of the combined cabinet is increased, and the effective space in the combined cabinet is relatively reasonably utilized.