A kind of method and apparatus are disclosed for providing negative pressure in a wound site. Device includes a suction pump, it is used to generate negative pressure, a negative-pressure container, the valve block for being arranged with the fluid communication path being optionally provided between reservoir and wound site, the negative pressure in negative-pressure container is greater than a threshold value negative pressure simultaneously, negative pressure needed for therefore providing one in wound site, wherein operative so that the one initial negative pressure of reconstruction in negative-pressure container in response to the pressure suction pump in the negative-pressure container for being reduced to threshold value negative pressure.
