The invention provides a weight measuring device and a vehicle detection system provided with the weight measuring device. The weight measuring device comprises a vertical supporting part, a horizontal supporting part, and a weight measuring sensor. The vertical supporting part is arranged telescopically along a vertical direction. The horizontal supporting part is disposed on the vertical supporting part, and one end of the vertical supporting part is used to drive the horizontal supporting part to move along the vertical direction, and the horizontal supporting part is used to carry a measured object. The weight measuring sensor is disposed on the vertical supporting part, and is used to detect the weight of the measured object. The weight measuring device is used to weigh various wheels of a vehicle and the loads of the wheels accurately, and the accuracy and the uniformity of the weight bearing performance of the wheels are improved, and therefore the weight measuring device is used for vehicle experiment preparation, and reliability of a vehicle experiment result is improved.