The invention relates to a controlled-release fertilizer resin and curing agent continuous mixing device and a working method thereof. A resin channel and a curing agent channel are arranged in a mixer body; a compressed air channel is arranged between the resin channel and the curing agent channel; a mixed liquid channel is opposite to the compressed air channel; the center line of the compressed air channel and the center line of the mixed liquid channel are located on a straight line; a mixing cavity communicated with the four channels is arranged between the mixed liquid channel and the resin channel, the curing agent channel and the compressed air channel; a spray head is arranged at an outlet of the mixed liquid channel; and when in mixing, the conveying pressure of the resin, curing agent and compressed air is controlled to be 0.3-0.5MPa. Through the invention, continuous mixing of resin and curing agent is realized in a controlled-release fertilizer production process, the mixing and coating are uniform, and the nutrients of the controlled-release fertilizer obtained by spraying are slowly released.