A waterproof stabilizer comprising a fastening assembly, a rotary assembly and a waterproof assembly, wherein the rotary assembly comprises a first motor, a second motor, a third motor, a first connecting arm piece and a second connecting arm piece; the first motor, the second motor and the third motor are spatially distributed orthogonally; a rotor of the first motor is connected to the fastening assembly; a stator of the first motor is fixedly connected to a rotor of the second motor via the first connecting arm piece; a stator of the second motor is fixedly connected to a rotor of the third motor via the second connecting arm piece; a first protective case and a first protective cover are arranged outside of the first motor, a side wall of the first protective case is connected to the first connecting arm piece, the first protective cover covers the first protective case; a second protective case and a second protective cover are arranged outside of the second motor, a side wall of the second protective case is connected to the second connecting arm piece, the second protective cover covers the second protective case; the waterproof assembly comprises a first seal ring, a second seal ring, a third seal ring, a fourth seal ring, a first waterproof plug, a second waterproof plug and a third waterproof plug; the first seal ring is arranged between the fastening assembly 1 and the rotor of the first motor; the second seal ring is arranged between the first protective case and the first protective cover; the third seal ring sheathes a shaft of the second motor; the fourth seal ring is arranged between the second protective case and the second protective cover; the first waterproof plug is located between the side wall of the first protective case and the first connecting arm piece; the second waterproof plug is located between the side wall of the second protective case and the second connecting arm piece; the third waterproof plug is disposed at one end of a shaft of the third motor and plugs a shaft socket of the third motor, wherein the waterproof stabilizer further comprises a base, a stator of the third motor is attached on a top surface of the base; the base comprises an outer case and a lid, the lid covers the outer case; an USB port and an indicating light are arranged on a surface of the outer case; the waterproof assembly further comprises a fifth seal ring, a fourth waterproof plug, a waterproof membrane and a waterproof plate; the fifth seal ring is set between the outer case and the lid; the fourth waterproof plug is attached to the surface of the outer case and fully covers the USB port; the waterproof membrane is attached to the surface of the outer case and fully covers the indicating light; the waterproof plate is perfectly attached on a surface of the lid. a first protective case and a first protective cover are arranged outside of the first motor, a side wall of the first protective case is connected to the first connecting arm piece, the first protective cover covers the first protective case; a second protective case and a second protective cover are arranged outside of the second motor, a side wall of the second protective case is connected to the second connecting arm piece, the second protective cover covers the second protective case; the waterproof assembly comprises a first seal ring, a second seal ring, a third seal ring, a fourth seal ring, a first waterproof plug, a second waterproof plug and a third waterproof plug; the first seal ring is arranged between the fastening assembly 1 and the rotor of the first motor; the second seal ring is arranged between the first protective case and the first protective cover; the third seal ring sheathes a shaft of the second motor; the fourth seal ring is arranged between the second protective case and the second protective cover; the first waterproof plug is located between the side wall of the first protective case and the first connecting arm piece; the second waterproof plug is located between the side wall of the second protective case and the second connecting arm piece; the third waterproof plug is disposed at one end of a shaft of the third motor and plugs a shaft socket of the third motor, wherein the waterproof stabilizer further comprises a base, a stator of the third motor is attached on a top surface of the base; the base comprises an outer case and a lid, the lid covers the outer case; an USB port and an indicating light are arranged on a surface of the outer case; the waterproof assembly further comprises a fifth seal ring, a fourth waterproof plug, a waterproof membrane and a waterproof plate; the fifth seal ring is set between the outer case and the lid; the fourth waterproof plug is attached to the surface of the outer case and fully covers the USB port; the waterproof membrane is attached to the surface of the outer case and fully covers the indicating light; the waterproof plate is perfectly attached on a surface of the lid.