An apparatus for assembling cable to connector includes a jig holder and a cable jig. The jig holder has a basic board defining a mounting space capable of locating a connector in the front thereof. The cable jig located in the rear of the mounting space of the jig holder has an upper jig member and a lower jig member disposed beneath the upper jig member. One of the jig members protrudes to form first spaced-apart barriers. A first receiving passage is defined between each pair of adjacent first spaced-apart barriers. The other jig member defines second receiving passages for receiving the first spaced-apart barriers respectively. A second spaced-apart barrier is defined between every two adjacent second receiving passages to space the two adjacent second receiving passages apart. The second spaced-apart barriers are inserted in the first receiving passages respectively.