Undersealing type plastic-envelop machine

The invention discloses an undersealing type plastic-envelop machine. The undersealing type plastic-envelop machine comprises a rack, a feeding assembly, a film feeding bag making assembly, a taking mechanical arm, two corner cutting mechanisms and a discharging assembly; a bag making station, a left corner cutting station and a right corner cutting station are sequentially arranged on the rack from front to back, the film feeding bag making assembly and the two corner cutting mechanisms are correspondingly arranged on the bag making station, the left corner cutting station and the right corner cutting station, the feeding assembly is used for conveying a product to the bag making station, the film feeding bag making assembly is used for providing a film material and packaging four faces of the product, and bag making operation is finished; the taking mechanical arm is used for moving the product; the two corner cutting mechanisms are used for carrying out corner cutting sealing on theleft and right sides of