The invention provides an indoor detection method for angle tracking precision of a swinging mirror. The indoor detection method comprises the following steps: (1) placing a plurality of parallel light tubes in a swinging mirror tracking range and pointing to the center of the swinging mirror to respectively set to a target 1, a target 2...a target n, setting the center of the swinging mirror to O; representing crossed points of connection lines of the targets and the O point, and a movement curve by A, B, C, D and the like, pointing a swinging mirror rotation starting point to the A point of the end point on a target movement curve, wherein the distance from the O point to the movement curve thetaOT is L and the L is the vertical distance from the O point to the plane where the movement curve is located; and (2) calibrating included angles including thetaAT, thetaBT, thetaCT and the like by using a total station, after calibrating, replacing the total station by a swinging mirror tracking system, wherein the thetaAT, the thetaBT and the thetaCT are the included angle of the A point and the OT, the included angle of the target 1 and the OT and the included angle of the target 2 and the OT. According to the indoor detection method for the angle tracking precision of the swinging mirror, the detection on the angle tracking precision of a high-speed movement target by the tracking system is realized by a static simulation target.