The invention provides a high-sealing-performance electric vehicle trunk which comprises a trunk body and a trunk cover. An opening of the trunk cover is of a groove type structure. The bottom of a groove is filled with a soft cushion. An opening of the trunk body is provided with a platform with a certain area. The platform is embedded in the groove. The trunk body is embedded in the trunk cover,the soft cushion serves as the clamping device, the trunk body and the trunk cover are closely connected, sealing performance is high, the waterproof effect is good, and looseness can no easily occur.