The invention discloses an adjustable heat air circulation timber drying and compression device and is used for compressing and drying impregnated timbers. The device comprises a sealed drying cabinet, at the periphery of which is a framed stander the upper part of which is provided with a pressure oil cylinder, a guide rod, a pressure plate, a displacement sensor, etc; wherein, the drying cabinet is internally provided with a timber loading car and a track; a metal template is arranged between the upper layer and the lower layer of the timbers; a variable frequency control fan and a heat exchanger are arranged an external end of the sealed drying cabinet; a variable frequency adjustable fan is adopted to force the heat air to circulate to heat. After saw into plates or squared timbers with specific dimensions, the impregnated timbers are loaded into a material cabinet according to specified layers, and the material cabinet is pushed into the drying cabinet along the guide rail, and the drying cabinet is closed, and the fan and the heat exchanger are turned on and the timbers in the material cabinet are heated to 90 DEG C; the pressure oil cylinder is turned on to add pressure, and the guide rod runs downward to drive the pressure plate to press the topmost layer of timber. According to the process specification of the timber drying and compression, a temperature and humidity control sensor and a transducer are used for adjusting ventilation and heating quantity in different drying and compression stages, and an air intake adjusting plate and an air returning adjusting plate are used for regulating the wind speed, and the displacement sensor is adopted to control the compression quantity and finally the ending of the drying process is judged through the temperature andhumidity control sensor.