Infrared detector with adjustable detection range

The invention relates to an infrared detector with adjustable detection range, comprising a housing, an infrared lens, a left protection baffle plate and a right protection baffle plate, wherein the housing comprises a lower housing and an upper housing fixed on the lower housing; the infrared lens is installed on the upper housing; the left protection baffle plate and the right protection baffleplate are dismountablely fixed on the upper housing and cover the infrared lens; preferably, the infrared lens is a sphere infrared lens; the upper housing comprises a first end and a second end, andthe infrared lens is installed on the first end/ the second end; and the left protection baffle plate and the right protection baffle plate are clamped with the upper housing. The infrared detector with adjustable detection range of the invention has artful design and convenient installation, effectively prevents pets and users from triggering to give alarm, can effectively protect doors, windowsand the like and is suitabl