The invention belongs to the technical field of metering devices characterized by adopting a mechanical method, and specifically discloses an engine cylinder head valve location degree detection device. The detection device comprises a base, a moving ascending unit, a fixed unit and a height gauge; the moving ascending unit comprises a cylinder, a water bag, a locating plate and a pressing plate, and push plates are arranged on a piston rod of the cylinder and a surface groove of the water bag; the fixed unit comprises a frame, a hydraulic cylinder, a support block and a locating rod, a runner and a through hole are formed in the frame, and the locating rod is connected with the through hole in a slide mode; the water bag is arranged at one side of the frame and communicated with one end of the runner, the other end of the runner is communicated with the hydraulic cylinder; a piston rod of the hydraulic cylinder is connected with a push rod in a hinged mode; the locating rod comprises a cone portion and a cylindrical portion connected with the cone portion, the cylindrical portion comprises an inner core, a spring and an elastic layer from inside to outside successively, the spring is connected between the inner core and the elastic layer. By adoption of the engine cylinder head valve location degree detection device, the cylinder head valve location degree is detected accurately, and meanwhile, the problem is solved that the work intensity of lifting and fixing of the cylinder head is large.