An infrared induction device with an adjustable induction angle comprises an installation base, an infrared induction head, an adjusting poking block, a shielding piece and a shielding piece supporting base. The adjusting poking block can horizontally move and is arranged on the back of the installation base, the front of the adjusting poking block is provided with strip-shaped grooves distributed in an inclined mode from left to right, the rear end of the shielding piece is provided with convex columns movably embedded in the strip-shaped grooves, the front end of the shielding piece is provided with a stopping piece capable of swinging upwards and downwards along with upward and downward swinging of the convex columns, the shielding piece supporting base is provided with a through hole right facing the infrared induction head, the stopping piece is arranged in front of the through hole, and the shielded area of the through hole shielded by the stopping piece can be adjusted through upward and downward swinging of the stopping piece. The infrared induction device has the advantages that the stopping piece of the shielding piece can be driven to upwards and downwards swing only by poking the adjusting pocking block, the stopping piece upwards and downwards swinging correspondingly enables the shielded area of the through hole to change, and accordingly adjustment of the induction angle of the infrared induction head is achieved, the whole structure of the infrared induction device is simple and adjustment is very convenient.