The invention relates to a quantitative analysis method for hydrogen fluoride gas in environment. The quantitative analysis method comprises a quantitative collecting device and quantitative detection. The quantitative collecting device comprises a gas measuring chamber, a nitrogen storage bottle, a qualitative analysis chamber, a quantitative analysis chamber and a quantitative analysis liquid storage tank; a gas feeding pipe is arranged on the left end of the gas measuring chamber; a first valve is arranged on the gas feeding pipe; a gas exhausting pipe is arranged on the gas feeding pipe between the first valve and the gas measuring chamber; the gas exhausting pipe is respectively connected with a first branch pipe and a second branch pipe through a one-way three-way valve; the first branch pipe is inserted into a qualitative analysis fluid in the qualitative analysis chamber; the second branch pipe is inserted into a quantitative analysis fluid in the quantitative analysis chamber;the qualitative analysis chamber and the quantitative analysis chamber are both equipped with gas exhausting pipes; one end of the gas exhausting pipes is above the liquid level of the analysis chambers while the other end is in direct contact with air; one-way valves are arranged on the gas exhausting pipes. The invention provides a quick and accurate quantitative evaluation method for analyzingthe content of hydrogen fluoride gas in an electrolyte manufacturing shop.