The invention discloses a mobile detection device for sulfur hexafluoride insulation electrical equipment, relates to the gas detection filed, and aims to solve the problem that in the prior art a sulfur hexafluoride detection instrument is usually moved by human force, so the work strength is large, the work efficiency is low, and moreover the testing pipelines and the instrument are easy to get damaged during the moving process. The detection device provided by the invention comprises a sulfur hexafluoride detection instrument and a cart for transporting the sulfur hexafluoride detection instrument. The sulfur hexafluoride detection instrument can be transported by the cart in an on-site detection in an electric power substation, thus the sulfur hexafluoride detection instrument can be moved between different sulfur hexafluoride insulation electrical equipment, the work strength is reduced, and the testing efficiency is improved; moreover the wear or breaking of testing pipelines can be avoided if the sulfur hexafluoride instrument is transported by the cart, and thus the detection instrument is well protected.