The utility model provides an environment-friendly gas insulation performance test device. The utility model relates to the technical field of power equipment, the gas tank comprises a gas tank body,two-way sleeve, a connecting piece, a measuring piece and a contact, wherein the connecting piece is respectively connected with the two-way sleeve and the contact, the two-way sleeve penetrates through the gas tank body, a first end of the connecting piece is connected with one end, located in the gas tank body, of the two-way sleeve, the contact is connected with a second end of the connecting piece, the contact is fixedly arranged in the gas tank body, and the measuring piece is connected with the connecting piece; the gas tank body is used for being filled with gas to be detected; the two-way sleeve is used for connecting a high-voltage power supply; and the measuring piece is used for measuring the insulation distance of the to-be-measured gas. According to the utility model, experimental exploration of insulating properties of various environment-friendly gases among various structures and under different pressures can be realized quickly and conveniently.