This museum was established to preserve ancient artifacts discovered within the temple grounds and those donated by local residents. It houses a wide variety of fascinating exhibits, with the main highlight being the "Phra Julai" or the golden head cover of the Phra Sri Arn image. Other notable items include exquisitely crafted lacquer scripture cabinets and ancient Buddha images from various periods. Furthermore, the museum displays antique household items such as Benjarong porcelain, glassware, and rare historical photographs from when King Chulalongkorn (Rama V) visited Wat Lai. These photographs are precious historical evidence reflecting the strong bond between the monarchy and this local community.