The invention discloses a speed limit cart, and belongs to the field of means of transport. The cart is characterized by comprising a cart body, a main shaft, wheels and speed limit boxes; the speed limit boxes are installed on the wheels; a first fixed plate and a second fixed plate are fixedly installed on the main shaft separately; an internal gear is arranged on the portion, close to the firstfixed plate, of a shell; the shell is internally provided with an accelerating gear set, a box body is arranged at the tail end of the accelerating gear set, the box body is internally provided witha sliding block which is connected with a connecting rod and a rocking rod in sequence, and a balance weight is arranged at the tail end of the rocking rod. Compared with the prior art, the cart has the advantage that the cart can achieve automatic speed limit when the cart goes downhill.