The invention discloses a lifting device for in-out cabin of fishing vessel, which comprises a frame, a power assembly and a lifting assembly. The power assembly comprises a servo motor, wherein the servo motor is linked with a transmission shaft through the speed reducer, a driving wheel is respectively installed at two ends of the transmission shaft, the driving wheel is connected with a drivenwheel fixedly installed on the top of the frame through a synchronous belt, and the synchronous belt is connected with a connecting plate and drives the lifting assembly to move up and down; The lifting assembly comprises a lifting platform, wherein the lifting platform is provided with a conveying channel for passing the cargo of the fishing vessel, and a group of driving conveying rollers and driven conveying rollers are arranged in the conveying channel, and the driving conveying rollers and the driven conveying rollers are linked through a conveying belt; On the bottom guide bracket of thelifting platform, a guide wheel unit cooperating with the guide rail is arranged on the guide bracket, and the guide wheel unit comprises a main pulley mounted on the guide bracket, and a plurality of sub pulleys positioned on the side of the main pulley.