Adjustable plastic coaming box

The utility model discloses an adjustable plastic coaming box which comprises a base, a bottom frame is fixedly connected to the outer wall of the top of the base, an inner frame body is clamped in the bottom frame, the side wall of the inner frame body is sleeved with an outer frame body, a plurality of guide grooves are formed in the outer wall of the inner frame body, and a plurality of guide blocks matched with the guide grooves are arranged on the inner wall of the outer frame body. A plurality of fixing bolts are in threaded connection with the outer wall of the outer frame body, a plurality of limiting grooves are formed in the inner wall of the outer frame body, a plurality of limiting bolts are in threaded connection with the inner wall of the inner frame body, a box cover is arranged at the top end of the outer frame body, and an embedded frame is fixedly connected with the outer wall of the bottom of the box cover. The guide blocks are connected into the guide grooves in a sliding mode, the guide b