A pipeline pressure monitoring device, comprising: a housing, one side of the housing having a mounting hole; a vent nozzle, the vent nozzle having a vent, the vent nozzle being installed in the housing, one end of the vent nozzle extending out of the housing via the mounting hole, a first stop block being provided on the vent nozzle; a first circuit board, installed in the housing; a pressure sensor, configured to detect pressure inside the vent nozzle, the pressure sensor being installed on the first circuit board and connected to the first circuit board, the pressure sensor being matched with another end of the vent nozzle facing an inside of the housing, the pressure sensor being installed at the another end of the vent nozzle facing the inside of the housing to block the another end; a sliding sleeve, installed in the mounting hole in a sliding manner, the sliding sleeve having a through hole, the sliding sleeve being sleeved on the vent nozzle via the through hole, a limit member being provided on the sliding sleeve, the limit member being located inside the housing; an elastic member, sleeved on the vent nozzle and sandwiched between the first stop block and the sliding sleeve; a magnetic block, installed on the sliding sleeve; a second circuit board, installed in the housing and connected to the first circuit board; and a position sensor, installed on the second circuit board and connected to the second circuit board, wherein the installation position of the position sensor meets that: after a consumable connector is installed on the vent nozzle, the distance that the sliding sleeve slides toward the inside of the housing is just enough to make the magnetic block move into a detection area of the position sensor. a housing, one side of the housing having a mounting hole; a vent nozzle, the vent nozzle having a vent, the vent nozzle being installed in the housing, one end of the vent nozzle extending out of the housing via the mounting hole, a first stop block being provided on the vent nozzle; a first circuit board, installed in the housing; a pressure sensor, configured to detect pressure inside the vent nozzle, the pressure sensor being installed on the first circuit board and connected to the first circuit board, the pressure sensor being matched with another end of the vent nozzle facing an inside of the housing, the pressure sensor being installed at the another end of the vent nozzle facing the inside of the housing to block the another end; a sliding sleeve, installed in the mounting hole in a sliding manner, the sliding sleeve having a through hole, the sliding sleeve being sleeved on the vent nozzle via the through hole, a limit member being provided on the sliding sleeve, the limit member being located inside the housing; an elastic member, sleeved on the vent nozzle and sandwiched between the first stop block and the sliding sleeve; a magnetic block, installed on the sliding sleeve; a second circuit board, installed in the housing and connected to the first circuit board; and a position sensor, installed on the second circuit board and connected to the second circuit board, wherein the installation position of the position sensor meets that: after a consumable connector is installed on the vent nozzle, the distance that the sliding sleeve slides toward the inside of the housing is just enough to make the magnetic block move into a detection area of the position sensor.