The invention discloses a pleural cavity puncturing device having a function of sucking liquid at a uniform speed, for department of respiration. The pleural cavity puncturing device having a functionof sucking liquid at a uniform speed, for department of respiration comprises a base, a liquid sucking puncturing unit and a driving unit, wherein a protrusion platform is integrally arranged on oneside of the upper part of the base; the liquid sucking puncturing unit is mounted at the upper part of the protrusion platform; the driving unit is mounted at the upper part of the base; and the driving unit is in transmission connection with the liquid sucking puncturing unit. Through the adoption of the pleural cavity puncturing device having a function of sucking liquid at a uniform speed, fordepartment of respiration disclosed by the invention, hydrops in the pleural cavity of a patient can be sucked at the uniform speed, so that the situation that when some nurses or doctors which are insufficient in experience suck the hydrops, the speed is too high or too low, and the puncturing effect is influenced can be effectively avoided, the situation that the nurses or the doctors can suck the hydrops in the pleural cavity of the patient at a uniform speed can be guaranteed, and the working strength of the nurses or the doctors can also be effectively reduced; and a protection layer is arranged, so that the functions of anticorrosion, antisepsis, skid resistance and aging resistance of the base are effectively improved, more importantly, the situation that a large quantity of bacteria are bred on the surface of the base can be avoided, and the hygienic condition is good.