The utility model relates to a buried-type chronograph for on-site dam-break experiments, which belongs to the technical field of outdoor dam-break experimental appliance. The chronograph comprises a lockable casing, wherein a timer with a button switch and a trigger are fixed in the casing respectively; the trigger includes an elastic mechanism, a hammerblock and a dowel; the elastic mechanism consists of a socket sleeve fixed on the inner wall of the casing as well as an ejector pin and a spring which are mutually connected inside the socket sleeve; the ejector pin penetrates the socket sleeve and is propped against the button switch of the timer; the hammerblock is horizontally placed at the top of the socket sleeve; three through holes are formed on the hammerblock, the socket sleeve and the ejector pin respectively in the corresponding positions; the dowel is installed in the through holes in a penetrating manner, and a convex part is formed at the end thereof near to the hammerblock; and the casing is made of a leafing material. The chronograph adopts the simple mechanical trigger structure that the dowel is directly mounted on the hammerblock and the ejector pin in a penetrating manner, thereby achieving the effect of more durable usage compared to the prior electronic trigger timers, and strongly guaranteeing the smooth implementation of outdoor on-site dam-break experiments.