A method for producing an organopolysiloxane emulsion composition, the method comprising: preparing a first emulsion composition by performing emulsification of a mixture comprising: 100 parts by mass of an organopolysiloxane represented by general formula shown below, and having an octamethylcyclotetrasiloxane content of not more than 1,000 ppm, HO(R 1 2 SiO) n H wherein each R 1 independently represents a hydrogen atom or a substituted or unsubstituted hydrocarbon group of 1 to 20 carbon atoms, and n represents a number that yields a viscosity at 25°C for the organopolysiloxane of 3,000 to 100,000 mm 2 /s, 1 to 100 parts by mass of a nonionic surfactant, 1 to 100 parts by mass of an anionic surfactant, provided that a mass ratio of component: component is within a range from 20:80 to 55:45, and (D-1) 1 to 10 parts by mass of water; and subjecting the first emulsion composition to emulsion polymerization, either without adding any water, or following addition of (D-2) not more than 100,000 parts by mass of water, the emulsion polymerization performed at a temperature of less than 40°C, in presence of an acid catalyst although the acid catalyst is unnecessary in those cases where the anionic surfactant has a catalytic action thus preparing a target emulsion composition, in which a viscosity at 25°C of the organopolysiloxane generated in a polymerization time of not more than 15 hours is 300,000 mPa·s or greater, and an amount of octamethylcyclotetrasiloxane contained in the organopolysiloxane is not more than 3,000 ppm. preparing a first emulsion composition by performing emulsification of a mixture comprising: 100 parts by mass of an organopolysiloxane represented by general formula shown below, and having an octamethylcyclotetrasiloxane content of not more than 1,000 ppm, HO(R 1 2 SiO) n H wherein each R 1 independently represents a hydrogen atom or a substituted or unsubstituted hydrocarbon group of 1 to 20 carbon atoms, and n represents a number that yields a viscosity at 25°C for the organopolysiloxane of 3,000 to 100,000 mm 2 /s, 1 to 100 parts by mass of a nonionic surfactant, 1 to 100 parts by mass of an anionic surfactant, provided that a mass ratio of component: component is within a range from 20:80 to 55:45, and (D-1) 1 to 10 parts by mass of water; and 100 parts by mass of an organopolysiloxane represented by general formula shown below, and having an octamethylcyclotetrasiloxane content of not more than 1,000 ppm, HO(R 1 2 SiO) n H wherein each R 1 independently represents a hydrogen atom or a substituted or unsubstituted hydrocarbon group of 1 to 20 carbon atoms, and n represents a number that yields a viscosity at 25°C for the organopolysiloxane of 3,000 to 100,000 mm 2 /s, 1 to 100 parts by mass of a nonionic surfactant, 1 to 100 parts by mass of an anionic surfactant, provided that a mass ratio of component: component is within a range from 20:80 to 55:45, and (D-1) 1 to 10 parts by mass of water; and subjecting the first emulsion composition to emulsion polymerization, either without adding any water, or following addition of (D-2) not more than 100,000 parts by mass of water, the emulsion polymerization performed at a temperature of less than 40°C, in presence of an acid catalyst although the acid catalyst is unnecessary in those cases where the anionic surfactant has a catalytic action thus preparing a target emulsion composition, in which a viscosity at 25°C of the organopolysiloxane generated in a polymerization time of not more than 15 hours is 300,000 mPa·s or greater, and an amount of octamethylcyclotetrasiloxane contained in the organopolysiloxane is not more than 3,000 ppm.