Fixed bed adsorption reactor

The invention discloses a fixed bed adsorption reactor, and relates to an adsorption reactor. The invention provides a glass fixed bed adsorption reactor which is convenient to use, stable and reliable and has a specific diameter-variable angle and a ground joint and of which the inside is embedded with a No.3 sand chip. An upper reactor main body and a lower reactor main body are arranged; the upper reactor main body is inserted into the lower reactor main body; the connecting position of the upper reactor main body and the lower reactor main body adopts the ground joint; the upper reactor main body is a cone; the top of the upper reactor main body is provided with an air inlet; the diameter-variable angle of the air inlet and the upper reactor main body is 28 to 32 DEG; the lower reactor main body is provided with a lower cylinder and a lower cone which are integrated; the bottom of the lower cone is provided with an air outlet; the diameter-variable angle of the air outlet and the lower cone is 28 to 32 DE