The invention provides a training aiding device and in particular provides a training aiding device for a volleyball court in the sports field. The invention aims to provide a volleyball training aiding device in the sports field, which is mature in technology, is more challenging and is low in cost. The training aiding device for a volleyball court in the sports field comprises a placing hopper, an electronic control valve, a hose, a lifting rod, a slide shaft, a swing rod, a second gear, a first gear, a lifting rack, a first spring, a cart, an iron block, an electromagnet, a right support, a guide plate, a moving rod, a groove body and a motor. The guide plate, the electromagnet and the right support are arranged on the top of the cart successively from left to right; the guide plate is provided with a first guide hole; the iron block is arranged on the left side of the electromagnet and the electromagnet is in contact with the iron block; the moving rod is arranged on the left side of the iron block; the moving rod penetrates the first guide hole. The training aiding device is mature in technology, more challenging, low in cost and durable.