The invention discloses a system for manufacturing an LED lamp. The system comprises a pasting mechanism, a lamp slice assembling mechanism and a drying mechanism. The lamp slice assembling mechanismcomprises a bracket, a worktable arranged on the bracket, a movable arm capable of moving left and right along the bracket, and a punch arranged on the movable arm; the drying mechanism comprises a plurality of rotatable drying pieces, a driving part for driving the drying pieces to rotate, gas-guide channels arranged in the drying pieces, and gas supply parts for supplying gas to the gas-guide channels; and a plurality of drying holes communicating to the gas-guide channels are formed in the outer surface of each drying piece in a spaced manner. Hot wind sprayed out is in direct contact witha surface-mounted LED lamp. Compared with a conventional drying mode, the drying speed is increased by at least 60%, and the drying efficiency is high; and moreover, the sprayed hot wind is in directcontact with the surface-mounted LED lamp, so that the heat energy loss is small, the energy consumption is reduced effectively, and the system saves energy and is environmentally friendly.