Groove type gas distribution device

The utility model discloses a groove type gas distribution device which comprises a main groove, a branch groove, a gas inlet pipe and a gas baffle, the main groove and the branch grooves are of groove structures with tops and without bottoms; vent holes are formed in the side wall of the main groove; the branch grooves are formed in two sides of the main groove and are communicated with the main groove through the vent holes; the air inlet pipe is fixed at the top of the main tank and communicated with the main tank; the gas baffle is fixed in the main tank and is opposite to the gas inlet pipe, and a gap is formed between the gas baffle and the top of the main tank; the branch groove is provided with a distribution hole and an overflow opening, and the distribution hole is located above the overflow opening. The device adopts a distribution groove structure, the bottom is open, crystals which are generated at the distribution holes and possibly block the device can be discharged from the bottom of the groov