The utility model relates to a connecting box with a pressure tapping machine, which comprises a connecting box body and a pressure cover. The middle part of the pressure cover is provided with a through hole for penetration of a spindle of the tapping machine, a baffle is arranged in the connecting box body, a cavity capable of being filled with a medium at the room temperature is formed by the baffle, the pressure cover and the inner wall of the connecting box body, and the sidewall of the connecting box body is provided with a medium inlet and a medium outlet communicated with the cavity. During the whole tapping process, the medium at the room temperature can be injected continuously into the cavity through the medium inlet and the medium outlet to form a thermal insulation layer so as to separate the sealed structure of the tapping machine from the low-temperature or high-temperature medium, the damage to the sealed structure caused by the low-temperature or high-temperature medium can be avoided, and tapping can be carried out on a low-temperature or high-temperature pipeline through the tapping machine limited for pressure tapping at the room temperature, the pressure tapping range of the tapping machine with no needs for stoppage of a conveyor belt can be enlarged, the utilization rate of equipment can be increased, the cost can be saved, and the connecting box has high practicality.