The invention provides an LED
light source lens device which comprises a cleaning mechanism, a holding mechanism, a circuit board, an SMD
light source and a protection shell. The holding mechanism isconnected to the lower end face of the protection shell. The circuit board is fixed to the inner lower portion of the protection shell through supporting legs. The SMD
light source is welded to the upper end face of the circuit board. The cleaning mechanism is mounted at the upper end of the protection shell in a sleeving manner and comprises cleaning cotton sleeves, a U-shaped frame, a connectingrod, a connecting sleeve plate, a
threaded rod, a baffle, lens bodiesy, containing grooves, a cover plate and a fixed rod. The holding mechanism comprises
handle rods, an open groove, a sliding groove, a fastening bolt, a sliding block, through holes, an adjusting bolt, a bottom plate, a first threaded hole, a
handle and micro suction cups. Compared with the prior art, the LED light source lens device has the following advantages that the protection function and the cleaning function are achieved, mounting convenience is also improved, the holding function is achieved, and turning adjustmentis facilitated.