A true and false sesame oil detection device includes a box, a bracket is mounted on the box, a cross bar is mounted on the bracket, a water pipe is mounted in the cross bar, the water pipe is connected with a water tap, a bowl is arranged below the water pipe, clean water is put in the bowl, an oil bottle is installed in the box, sesame oil is installed in the oil bottle, the sesame oil is connected with a straw, and a suction ball is mounted on the straw top. The true and false sesame oil detection device can accurately detect the true and false sesame oil. If the sesame oil is true, the sesame oil in the water may quickly spread, and if the sesame oil is false, the sesame oil may not quickly spread, and gathers in a drop. The true and false sesame oil detection device can detect if the sesame oil is true or false, so that the general public may not be tricked to buy products which are fake.