The invention provides an automatic spinning assembly mechanism for a shift switch solenoid valve. The mechanism comprises a control system and a rack system which are connected with each other; the rack system comprises a foundation platform as well as a rotary motor, a speed reducing mechanism, a mounting chuck, a shift switch solenoid valve clamping tool, a shift switch solenoid valve workpiece, a centre tool, a counterforce regulating mechanism and a spinning chuck which are sequentially arranged in the axial direction, wherein a spinning feeding mechanism and a linear motor are sequentially arranged between the centre tool and the counterforce regulating mechanism in a direction vertical to the axes of the centre tool and the counterforce regulating mechanism; and the foundation platform comprises a region A and a region B, a longitudinal slot is formed in the bottom plane of the region A, two longitudinal slots located inside the region B and parallel at the lower parts and a horizontal slot located at the upper part of the region B and close to the region A part are formed in the region B, and the two longitudinal slots are unequal in length in order to regulate the position between a laser source of a laser displacement sensor and a reflecting plate so as to guarantee the requirement for the optimal measuring distance.