A method for correcting in-phase and quadrature-phase IQ signals, comprising: saving an I signal of a last frame and a Q signal of the last frame; receiving an I signal of a current frame and a Q signal of the current frame; statistically measuring an average level value of the I signal of the last frame to obtain a direct-current offset of the I signal of the last frame, and eliminating a direct-current offset of the I signal of the current frame according to the direct-current offset of the I signal of the last frame; statistically measuring an average level value of the Q signal of the last frame to obtain a direct-current offset of the Q signal of the last frame, and eliminating a direct-current offset of the Q signal of the current frame according to the direct-current offset of the Q signal of the last frame, characterized by; saving an I signal of the frame whose direct-current offset is eliminated and a Q signal of the frame whose direct-current offset is eliminated; expressing, by using a constellation diagram, the I signal of the last frame whose direct-current offset is eliminated and the Q signal of the last frame whose direct-current offset is eliminated; statistically measuring mean vectors in a first quadrant and a second quadrant of the constellation diagram of the I signal of the frame whose direct-current offset is eliminated and the Q signal of the frame whose direct-current offset is eliminated to obtain a first vector and a second vector; calculating a third vector and a fourth vector according to the first vector and the second vector, and calculating an included angle α between the fourth vector and an X axis, wherein the third vector is a mean vector of the first vector and the second vector, and the fourth vector is a difference between the first vector and the second vector; and geometrically correcting the I signal of the current frame whose direct-current offset is eliminated and the Q signal of the current frame whose direct-current offset is eliminated according to the third vector, the fourth vector, and the included angle α to obtain the corrected I signal of the current frame and the corrected Q signal of the current frame. saving an I signal of a last frame and a Q signal of the last frame; receiving an I signal of a current frame and a Q signal of the current frame; statistically measuring an average level value of the I signal of the last frame to obtain a direct-current offset of the I signal of the last frame, and eliminating a direct-current offset of the I signal of the current frame according to the direct-current offset of the I signal of the last frame; statistically measuring an average level value of the Q signal of the last frame to obtain a direct-current offset of the Q signal of the last frame, and eliminating a direct-current offset of the Q signal of the current frame according to the direct-current offset of the Q signal of the last frame, characterized by; saving an I signal of the frame whose direct-current offset is eliminated and a Q signal of the frame whose direct-current offset is eliminated; expressing, by using a constellation diagram, the I signal of the last frame whose direct-current offset is eliminated and the Q signal of the last frame whose direct-current offset is eliminated; statistically measuring mean vectors in a first quadrant and a second quadrant of the constellation diagram of the I signal of the frame whose direct-current offset is eliminated and the Q signal of the frame whose direct-current offset is eliminated to obtain a first vector and a second vector; calculating a third vector and a fourth vector according to the first vector and the second vector, and calculating an included angle α between the fourth vector and an X axis, wherein the third vector is a mean vector of the first vector and the second vector, and the fourth vector is a difference between the first vector and the second vector; and geometrically correcting the I signal of the current frame whose direct-current offset is eliminated and the Q signal of the current frame whose direct-current offset is eliminated according to the third vector, the fourth vector, and the included angle α to obtain the corrected I signal of the current frame and the corrected Q signal of the current frame.