The utility model discloses a teaching demonstration device of a wet-type alarm valve and wet-type alarm valve accessories. The teaching demonstration device includes the wet-type alarm valve and a delayer. A before-valve water supply general control valve, a bell testing valve, a water discharging valve, an upper pressure meter, a lower pressure meter, and a water spraying vertical pipe are arranged on the wet-type alarm valve. A delayer water inlet pipe, a delayer water outlet pipe, and a delayer water discharging pipe are arranged on the delayer. A water power alarm bell and a pressure switch are arranged on the delayer water outlet pipe of the delayer. The wet-type alarm valve is connected with the delayer through the delayer water inlet pipe. The object of the teaching demonstration device is to provide a teaching demonstration device of an automatic sprinkler system which is able to reflect the structure of the components and working principle intuitively by employing transparent materials for part of the device, and to provide a way of intuitive understanding for the automatic sprinkler system, and which is beneficial for training of installation, reparation, maintenance, and usage skills.