The invention relates to a uniform curing device for a concrete test block. The uniform curing device for the concrete test block comprises a curing box and a humidifying water tank, wherein the curing box is arranged on a supporting structure; the humidifying water tank communicates with the curing box; at least one through hole is formed in the top of the curing box; a clamping fixing structureis rotationally arranged in each through hole; rotary brackets matched with the number of the through holes are arranged in a cavity of the curing box; the top of the curing box is fixed through the clamping fixing structures; a vent hole is formed in the center of a bottom plate of the curing box; a cylindrical transition block covers the vent hole; a circular hole is formed in the top of the transition block; a humidifying column is arranged at the top of the transition block; the humidifying column communicates with the transition block and the vent hole through the circular hole; at leastone vent hole is formed in the column wall of the humidifying column; the humidifying water tank is filled with water; and the humidifying water tank is also provided with a high-frequency ultrasonicgenerator for converting the water into mist. According to the uniform curing device for the concrete test block, the defects of differential humidity inside a traditional standard curing box and uneven strength development of each part of a test block are overcame, and uniform and appropriate curing conditions for curing the concrete test block are provided.