The invention provides a sensor calibration apparatus including a wood testing room, a sensor, a cold air generation source, and a non-metal pipeline, the wood testing room includes vertically arranged support rods, a bottom layer frame, an intermediate layer frame, and a top layer frame, the bottom layer frame, the intermediate layer frame, and the top layer frame are embedded on the support rods, a flat board is arranged on the intermediate layer frame, the top layer framer is provided with a top board, a calibration chamber having an enclosed space is formed between the flat board, the top board, and the support rods, the inner walls of the calibration chamber are provided with insulation layers, the sensor is arranged in the calibration chamber, the non-metal pipeline is connected with the calibration chamber and the cold air generation source, the wood testing room is arranged indoors and has no metal around within the range of 4m. The sensor calibration apparatus has no magnetic interference around within the range of 4 meters and is low in cost (about 8,000 yuan), and thick insulation layers which can keep the calibration chamber at 0 DEG C are arranged indoors.