A vehicle-mounted motion simulation platform based on active suspension, the vehicle-mounted motion simulation platform comprises a vehicle body, a motion simulation platform fixedly connected to the vehicle body, an upper computer for posture control, a gyroscope, an electronic control unit, a servo controller group, a plurality of wheels (2, 3, 4.1, 4.2), suspension servo actuating cylinders (5, 6, 7.1, 7.2) respectively corresponding to the wheels (2, 3, 4.1, 4.2) one by one, and displacement sensors (8, 9, 10.1, 10.2) respectively corresponding to the wheels (2, 3, 4.1, 4.2) one by one; wherein the gyroscope is fixed on the motion simulation platform; the electronic control unit and the servo controller group are fixed on the vehicle body; the wheels (2, 3, 4.1, 4.2) are connected to a lower part of the vehicle body by the suspension servo actuating cylinders (5, 6, 7.1, 7.2); the displacement sensors (8, 9, 10.1, 10.2) are configured to measure stroke of the suspension servo actuating cylinders (5, 6, 7.1, 7.2); the electronic control unit is in communication with the gyroscope and the servo controller group, respectively; the servo controller group is in communication with the displacement sensors (8, 9, 10.1, 10.2); the electronic control unit is configured to calculate posture control parameters based on instructions of a platform posture input by the upper computer and information of the platform posture measured by the gyroscope, and is configured to then output the posture control parameters to the servo controller group; the servo controller group is configured to control the extension of the suspension servo actuating cylinders (5, 6, 7.1, 7.2) according to the posture control parameters to realize follow-up control of the platform posture; wherein a first set of wheels (4.1, 4.2) of the plurality of wheels are an equivalent supporting point; upper chambers of the suspension servo actuating cylinders (7.1, 7.2) respectively corresponding to the first set of wheels (4.1, 4.2) are communicated with each other, and lower chambers of the suspension servo actuating cylinders (7.1, 7.2) respectively corresponding to the first set of wheels (4.1, 4.2) are communicated with each other; the upper chambers are connected with each other through an upper chamber connecting pipeline (16.1); the lower chambers are connected with each other through a lower chamber connecting pipeline (16.2); function of the first set of wheels (4.1, 4.2) and the suspension servo actuating cylinders thereof supporting the vehicle body is equivalent to that of the supporting point, while a second set of two wheels (2, 3) of the plurality of wheels comprising all wheels not being part of the first set of wheels (4.1, 4.2) and the suspension servo actuating cylinders thereof respectively form supporting points for the vehicle body, and the vehicle body has three supporting points totally; the first set of wheels (4.1, 4.2) being two rear wheels, wherein the first set of wheels (4.1, 4.2) and the suspension servo actuating cylinders thereof have the same structure, so that the equivalent supporting point is a midpoint of an upper hinge point on the suspension servo actuating cylinders (7.1, 7.2) corresponding to the wheels (4.1, 4.2); and the electronic control unit is configured to control the height of the equivalent supporting point by controlling an average value (l 7) of the extension of the suspension servo actuating cylinders (7.1, 7.2) corresponding to the fist set of wheels (4.1, 4.2).