The utility model relates to an adjustable horizontal multi-component sensor protective casing. The adjustable horizontal multi-component sensor protective casing comprises an upper casing and a lower plate. The upper casing provided with a multi-component sensor is fixedly installed on the lower plate, the side surface of the upper casing is provided with a cable socket, the lower plate is of a triangular structure, the three corners of the triangular structure are each provided with a support height-adjustable adjusting wheel, and the upper casing is provided with a leveling bubble displaying a horizontal degree. The horizontal adjustment of the whole protective casing is realized through the cooperation between the adjusting wheels and the leveling bubble. An illumination device is also installed below the leveling bubble for horizontal adjustment in case of insufficient light. The advantages are as follows: the structure is simple and reasonable, horizontal adjustment is convenient, and operation and application are convenient. Therefore, the adjustable horizontal multi-component sensor protective casing is an ideal adjustable horizontal multi-component detector protective casing.