A cryogenic liquid turbine is provided, wherein, impeller end of the rotor and nozzle assembly are received into cavity of volute, and main part of the volute is put into perlite cold box; insulation pad is used between the volute and machine housing to insulate heat; impeller outlet is connected to diffuser pipe. A nozzle assembly is connected to the machine housing by a nozzle compression flange; a nozzle compression plate adjusts a compactness of nozzle vanes by a disc spring; a nozzle turntable is connected on a nozzle chassis, and adjusts the nozzle vane stagger angle by adjusting mechanism passing through the volute; impeller shroud side seal is axially fixed on the nozzle compression flange, and a shaft seal is axially fixed to a seal gas part; the seal gas part and an oil seal are axially fixed to the machine housing by a bolt.