Special plate-fin heat exchanger capable of being conveniently inspected and installed

The invention provides a special plate-fin heat exchanger capable of being conveniently inspected and installed, and relates to the field of heat exchangers. The heat exchanger comprises a core body,wherein the core body comprises a channel for fluid circulation, the channel comprises hot channels for hot fluid circulation and cold channels for cold fluid circulation, the hot channels and the cold channels are sequentially alternatively arranged from top to bottom, partition plates are arranged between the hot channels and the cold channels, the channels are in an annular shape, fins are arranged in the channels, the fins divide the channels into a plurality of fin channels, the fin channels are arranged in the radial direction of the channels, and the widths of the fin channels are gradually increased from the ends close to the circle centers of the channels to the other ends away from the circle centers of the channels. According to the special plate-fin heat exchanger capable of being conveniently inspected and installed, the widths of the fin channels are gradually increased from one ends to the other ends, and the problems that due to the fact that the width of a flow channelis not changed in the prior art, hot fluid is gradually cooled, so that the speed of the hot fluid becomes slow, and the heat transfer efficiency is low are solved.