The invention relates to an external support MEMS resonant gyroscope with four mass blocks. The gyroscope comprises a base plate layer and a structural layer located above the base plate layer. The structural layer comprises a supporting frame, four anchoring supporting columns, the four mass blocks, four drive detecting units and four drive units, wherein the supporting frame is provided with four symmetrical shafts and is of an octagon plane frame structure, the anchoring supporting columns are distributed on the outer side of the supporting frame uniformly in the mode of being symmetrical about the circumference with the symmetrical center of the supporting frame as the circle center, the four mass blocks are distributed on the inner side of the supporting frame uniformly in the mode of being symmetrical about the circumference with the symmetrical center of the supporting frame as the circle center, the four drive detecting units are arranged between the four mass blocks and the supporting frame respectively, and the four drive units are arranged at one sides, away from the supporting frame, of the four mass blocks respectively. The two opposite mass blocks are identical. A movable capacitance detecting polar plate is arranged at one side, close to the supporting frame, of each mass block, and a movable capacitance driving polar plate is arranged at one side, away from the supporting frame, of each mass block. The mass blocks can generate dominant mode vibration, or generate secondary mode vibration, or generate dominant mode vibration and secondary mode vibration at the same time.