Abstract: The present invention relates to an automatic medical device cleaning agent supply device, comprising a case, peristaltic pump unit, timer unit, foot switch, and controller, that automatically supplies the cleaning solution into the cleaning tank to clean medical devices in an amount relative to the amount of water in the cleaning tank when the foot switch is pressed and wherein an attachment housing is secured on a fixed housing in the peristaltic pump unit in a detachable manner for the attachment housing to be selectively detached to facilitate tube replacement and use, through which the tube, which is a consumable, can be replaced conveniently to ensure the ease of maintenance of the device.