The invention discloses a chain saw clutch and chain heat dissipation device. The device comprises a right box body, a chain plate, a right crank, a holder, shoe blocks, a clutch shell, a chain wheel,a saw chain and a brake band, wherein a plurality of chain plate air inlets and a plurality of shell air inlets corresponding to the saw chain and saw tooth are arranged on the chain plate and the clutch shell respectively; an outer cover of the clutch shell and the shoe blocks form a shell annular inner channel, the outer cover of the clutch shell, and the brake band and the outer wall of a clutch chamber form a shell annular outer channel; an annular flow guide plate is arranged on the chain plate, the annular flow guide plate and a chain plate shell form an annular jet channel, and an airoutlet of the shell annular outer channel is directly facing the annular jet channel; and a shoe block gap is formed between the adjacent shoe blocks, and an air outlet communicating with the annularjet channel is formed in the chain plate. After the structure is adopted, the chain saw clutch and chain heat dissipation device has the advantages of being simple and reasonable in structure, convenient to install and use, good in heat dissipation effect, high in saw cutting efficiency, long in service life, capable of purging chain plate sawdust and the like.