The present invention discloses a weighing device special for a chemical product. The weighing device comprises a weighing trough, a pulling plate, a first guide rod, a strain gage and a bottom support plate. The bottom end of the weighing trough is provided with a trough bottom plate, one side of the trough bottom plate is provided with a pulling plate, the bottom portion of the weighing trough is provided with a first guide rod, the bottom portion of the first guide rod is provided with a strain gage, one side of the strain gage is provided with a first buffer cylinder, the other side of thestrain gage is provided with a discharge tube, one side of the discharge tube is provided with a second guide rod, and one side of the second guide rod is provided with a second buffer cylinder. Thefirst buffer cylinder and the second buffer cylinder are arranged to buffer the suddenly dropping weighing trough so as to avoid that the measurement is not accurate caused by sudden contact of the first guide rod and the second guide rod and the strain gage, and the set pulling plate can avoid direct contact of the final chemical product and operators so as to improve the weighing efficiency.