The invention discloses a tire mechanical property intelligent detection device and a detection method thereof. The detection device comprises a tire, a rim, a gravity sensor, a camera and a marking point; the gravity sensor and the camera are arranged at the same circumferential position of the rim; the marking point is positioned on the surface of the inner side of the tire; the camera is arranged over against an area of the marking point. The detection method adopts a neural network algorithm; when the working tire is deformed, the camera is utilized to acquire displacement variation of a phosphor dot and a tire force is obtained by the neural network algorithm; a six-component sensor is not required for measuring a tangential force, an axial force, a vertical force, a running torque, a rolling moment and a yawing moment on a rotary drum test bench to realize solution of a longitudinal force, a lateral force, a vertical load, a running torque, a rolling moment and an aligning torque of the tire; the tire mechanical property intelligent detection device has the advantages of being simple and compact in structure, simple and convenient to operate, low in cost and the like.