The invention discloses a constant-temperature hot sublimation color development machine. The machine comprises a frame (1), a scutching cloth release roller (2), a cloth collection conveying roller (3), an oil electric heating roller (4), a speed reducing motor (5), a bracket (6), a rotating joint (7), an oil tank (8), an electric heater (9), an electric brush device (10), a smoke collecting cover (11), a smoke discharge pipe (12), a fan (13), a front cover plate (14) and a back cover plate (15). The constant-temperature hot sublimation color development machine has the following advantages: heat conducting oil is used for heating, so that cloth is uniformly heated, the color development and color fixation performances are improved, and product patterns are beautiful in colors and not liable to fade; and dye lampblack generated in the heating process is timely discharged to simulate secondary pollution of the lampblack to the cloth so as to improve the color development effect.