A tray disinfection device for a security inspection system, comprising: a frame; a disinfection channel on the frame, wherein an ultraviolet disinfection lamp is arranged in the disinfection channel; and a conveying mechanism on the frame and configured to convey a tray to pass through the disinfection channel, so as to disinfect the tray through an irradiation of the ultraviolet disinfection lamp, wherein the disinfection channel comprises: a base plate connected to the frame and located above the conveying mechanism, wherein the ultraviolet disinfection lamp is installed on the base plate; a first bottom shading plate below the conveying mechanism, and the first bottom shading plate is made of a mirror stainless steel; and two first side shading plates on both sides of the conveying mechanism respectively, wherein the two first side shading plates, the first bottom shading plate and the base plate enclose to form the disinfection channel, and at least one end of the conveying mechanism along a conveying direction is provided with a shading channel in communication with the disinfection channel, characterized in that the shading channel comprises: a top shading plate connected to the frame and located above the conveying mechanism; a second bottom shading plate below the conveying mechanism; and two second side shading plates on both sides of the conveying mechanism respectively, wherein the two second side shading plates, the second bottom shading plate and the top shading plate enclose to form the shading channel; and wherein inner surfaces of the top shading plate, the second bottom shading plate and the second side shading plates are subjected to blackening, frosting or hairline treatments. a frame; a disinfection channel on the frame, wherein an ultraviolet disinfection lamp is arranged in the disinfection channel; and a conveying mechanism on the frame and configured to convey a tray to pass through the disinfection channel, so as to disinfect the tray through an irradiation of the ultraviolet disinfection lamp, wherein the disinfection channel comprises: a base plate connected to the frame and located above the conveying mechanism, wherein the ultraviolet disinfection lamp is installed on the base plate; a first bottom shading plate below the conveying mechanism, and the first bottom shading plate is made of a mirror stainless steel; and two first side shading plates on both sides of the conveying mechanism respectively, wherein the two first side shading plates, the first bottom shading plate and the base plate enclose to form the disinfection channel, and at least one end of the conveying mechanism along a conveying direction is provided with a shading channel in communication with the disinfection channel, characterized in that the shading channel comprises: a top shading plate connected to the frame and located above the conveying mechanism; a second bottom shading plate below the conveying mechanism; and two second side shading plates on both sides of the conveying mechanism respectively, wherein the two second side shading plates, the second bottom shading plate and the top shading plate enclose to form the shading channel; and wherein inner surfaces of the top shading plate, the second bottom shading plate and the second side shading plates are subjected to blackening, frosting or hairline treatments. a base plate connected to the frame and located above the conveying mechanism, wherein the ultraviolet disinfection lamp is installed on the base plate; a first bottom shading plate below the conveying mechanism, and the first bottom shading plate is made of a mirror stainless steel; and two first side shading plates on both sides of the conveying mechanism respectively, wherein the two first side shading plates, the first bottom shading plate and the base plate enclose to form the disinfection channel, and at least one end of the conveying mechanism along a conveying direction is provided with a shading channel in communication with the disinfection channel, characterized in that the shading channel comprises: a top shading plate connected to the frame and located above the conveying mechanism; a second bottom shading plate below the conveying mechanism; and two second side shading plates on both sides of the conveying mechanism respectively, wherein the two second side shading plates, the second bottom shading plate and the top shading plate enclose to form the shading channel; and wherein inner surfaces of the top shading plate, the second bottom shading plate and the second side shading plates are subjected to blackening, frosting or hairline treatments. a top shading plate connected to the frame and located above the conveying mechanism; a second bottom shading plate below the conveying mechanism; and two second side shading plates on both sides of the conveying mechanism respectively, wherein the two second side shading plates, the second bottom shading plate and the top shading plate enclose to form the shading channel; and wherein inner surfaces of the top shading plate, the second bottom shading plate and the second side shading plates are subjected to blackening, frosting or hairline treatments.