The invention discloses a technology for weft knitting hollow small jacquard elastic silk, and the technology comprises the steps of adopting a composite organization of one-side flat needle organization and jacquard organization by using 140 branches/2 shares of silk, 1/27/29den mulberry silk and 40-70den spandex; braiding, namely knitting in a cycle of AABBCCBB and braiding in a cycle of 14 paths; passing yarn, namely passing through spun silk and spandex in 1st-6th paths and 8th-13th paths, passing through mulberry silk in the 7th path and the 14th path, braiding 1st-3rd channels of 1st-6th paths and 8th-13th paths in loops to form a one-side flat needle area, then braiding floating yarn, lap and loop respectively in the first channel knitting needle, the second channel knitting needle and the third channel knitting needle of the 7th path to form a hollow jacquard part, braiding the loop, the lap and the floating yarn respectively in the first channel knitting needle, the second channel knitting needle and the third channel knitting needle of the 14th path to form a hollow jacquard part. According to the invention, the hollow small jacquard elastic silk has a good quality, an obvious hollow out effect and needs no cashmere cutting.