The invention relates to a device and a method for using microwaves for removing tumors, stopping bleeding, clotting, relieving pains and improving
blood circulation. The method includes: using a camera 28 for shooting a
lesion 4, enabling a computer 32 to control a scribing
machine 31 to scribe voids 13, 14 and 15 of
metal stencils 8, 9 and 10 of a three-dimensional
lesion projection, radiating
microwave beams 19, 20 and 21 penetrating the voids of the stencils in turns from an opposite three-dimensional direction of the
projection direction onto the
lesion, and enabling the
microwave beams to form a high-temperature
microwave radiation area 26 coincident with the three-dimensional projection, wherein the temperature of the high-temperature microwave
radiation area 26 is higher than a withstanding temperature 43 DEG C of
cancer cells; enabling a
normal cell tissue 53 to be positioned in a temperature area 25 formed by
radiation of nonoverlapped one-dimensional wave beams, wherein the temperature of the temperature area 25 is lower than 40 DEG C. The
metal stencils define radiation ranges and positions, a
pulse microwave generator and a lens antenna transmit parallel microwave beams 44, 45 and 46, running water controls radiation sequence, and a pyroelectric
infrared thermometer and an overtemperature power
cut circuit control the
radiation temperature. Accurate heating position and range, safety in treatment, painlessness, quickness, one-time completion and thoroughness in killing of
cancer cells and low cost are realized.