The invention relates to the technical field of detergent detection, and discloses a synthetic detergent production detection device which comprises a product conveying line and a detection table, the detection table is located on the left side of the product conveying line, an annular feeding piece is arranged at the top of the detection table, and a sample cup is placed at the top in the annular feeding piece; a driving shaft is rotatably connected to the detection table, a raised line I is fixedly mounted on the circumferential surface of the driving shaft, a shaft sleeve is slidably connected to the driving shaft and the raised line I, and a
piston sampling piece is arranged between the top of the driving shaft and the top of the shaft sleeve; and a
viscosity detection piece is arranged on the rear side of the top of the detection table. When the
piston barrel deflects to the position over the product conveying line, the output end of the second air cylinder shrinks, so that the interior of the
piston barrel is in a negative pressure state, and the detergent enters the piston
barrel; after the piston barrel moves to the position over the sample cup, the output end of the second air cylinder extends, and the detergent in the piston barrel is extruded into the sample cup; therefore, the purpose of automatic sampling is achieved.