Cable branch box capable of preventing rainwater immersion

The invention discloses a cable branch box capable of preventing rainwater immersion, which comprises a box body, the box body is provided with a lifting mechanism, the upper part of the box body is provided with an auxiliary maintenance mechanism, the auxiliary maintenance mechanism is used for carrying out rain shielding operation on the cable branch box during maintenance, two sides of the box body are provided with ventilation waterproof mechanisms, and one surface of the box body is hinged with a box cover. And a control mechanism is arranged in the box body. During maintenance in rainy days, a worker opens the magnetic lock through the access controller and then turns over to open the box cover, after access opening information is received, the control panel judges that the box cover is opened in the rainy days according to the rainfall detector, the driving motor is immediately controlled to rotate clockwise, the gear is driven to be meshed with the rack, and the rainproof plate is pushed from the inse