Polyethylene glycol series products can be used in pharmaceuticals. Polyethylene glycol with a relatively low molecular weight can be used as a solvent, co-solvent, O/W emulsifier, and stabilizer for the preparation of suspensions, emulsions, injections, etc. It is also employed as a water-soluble ointment base and suppository base. Solid waxy polyethylene glycol with a higher molecular weight is often used to increase the viscosity and solidity of low molecular weight liquid PEG, as well as to compensate for other drugs externally. For drugs that are not easily soluble in water, this product can serve as a carrier for solid dispersants to achieve solid dispersion purposes.