Cable connection casing

A cable connection casing (1) comprises a pillar (5), wherein a waterproof structure is formed between the pillar (5) and a cable. When the cable connection casing is carrying out halfway guiding branch connection, the pillar coordinates with an elastic contracting sleeve (13) to perform waterproof processing, so as to solve the technical problems in the prior art that when the cable connection casing which uses the elastic contracting sleeve to perform waterproof processing is carrying out the halfway guiding branch connection, the operation is difficult to handle, the cost is high, and the construction quality is inconsistent.