A multi-rotor small unmanned aerial vehicle, comprising: a tri-axis platform, comprising: a dual-axis platform, comprising a machine frame assembly and a transmission assembly, the machine frame assembly comprises a first bracket, a second bracket and a third bracket, wherein the first bracket is configured to fix a shooting assembly, the first bracket is rotatably arranged with the second bracket, and the second bracket is rotatably arranged with the third bracket, the transmission assembly comprises a first motor and a second motor, wherein the first motor is configured to directly drive the first bracket to rotate relative to the second bracket, and the second motor is configured to directly drive the second bracket to rotate relative to the third bracket, wherein the transmission assembly further comprises a third motor, the machine frame assembly further comprises a connecting frame for fixing externally, and the third motor is configured to directly drive the third bracket to rotate relative to the connecting frame; and characterized in comprising a multi-rotor mounting frame, the multi-rotor mounting frame comprising: a support frame; a base on which the connecting frame is fixed; a plurality of support arms fixedly arranged on the base; and rotor members disposed on the support arms. a tri-axis platform, comprising: a dual-axis platform, comprising a machine frame assembly and a transmission assembly, the machine frame assembly comprises a first bracket, a second bracket and a third bracket, wherein the first bracket is configured to fix a shooting assembly, the first bracket is rotatably arranged with the second bracket, and the second bracket is rotatably arranged with the third bracket, the transmission assembly comprises a first motor and a second motor, wherein the first motor is configured to directly drive the first bracket to rotate relative to the second bracket, and the second motor is configured to directly drive the second bracket to rotate relative to the third bracket, wherein the transmission assembly further comprises a third motor, the machine frame assembly further comprises a connecting frame for fixing externally, and the third motor is configured to directly drive the third bracket to rotate relative to the connecting frame; a dual-axis platform, comprising a machine frame assembly and a transmission assembly, the machine frame assembly comprises a first bracket, a second bracket and a third bracket, wherein the first bracket is configured to fix a shooting assembly, the first bracket is rotatably arranged with the second bracket, and the second bracket is rotatably arranged with the third bracket, the transmission assembly comprises a first motor and a second motor, wherein the first motor is configured to directly drive the first bracket to rotate relative to the second bracket, and the second motor is configured to directly drive the second bracket to rotate relative to the third bracket, wherein the transmission assembly further comprises a third motor, the machine frame assembly further comprises a connecting frame for fixing externally, and the third motor is configured to directly drive the third bracket to rotate relative to the connecting frame; and characterized in comprising a multi-rotor mounting frame, the multi-rotor mounting frame comprising: a support frame; a base on which the connecting frame is fixed; a plurality of support arms fixedly arranged on the base; and rotor members disposed on the support arms. a support frame; a base on which the connecting frame is fixed; a plurality of support arms fixedly arranged on the base; and rotor members disposed on the support arms.